Science - 4 Primary - 1st Term - 2023-2024 PDF

Geel 2000 Language Schools Science Department Primary (4) First term (2023-2024) Name:……………………………………….. Class:…………………………………………. I love Science 1  Concept (1) Adaptation for survival Camel...

Geel 2000 Language Schools Science Department Primary (4) First term (2023-2024) Name:……………………………………….. Class:…………………………………………. I love Science 1  Concept (1) Adaptation for survival Camel its body is covered with thick hairy skin to protect it from hot weather of desert. Palm trees have strong roots to fix them in the Palm trees soil against strong winds in desert. They are characteristics that help living organisms to survive and reproduce in the ecosystem in which they live. Ecosystem: is an area in which living and non living things interact with each other. othother. 2 Habitat: is the environment where living organisms live in. 3 Predator is an animal that eats another animal. Prey is an animal that is eaten. ( Polar region) (black bear) 4 Types of adaptation 5  (tan colored fur) (it hides in sandy and rocky environment (camouflage) (it takes up 700 breaths per minute). s. 6  It lives in burrows to stay warm at night. The special shape of ears in both fennec and arctic foxes allow excellent hearing to help them hunt. 7  (it uses countershading camouflage strategy) (preys) *Only bull sharks live in fresh water So it has less competition to find food. cut ( it can surprise its prey ) Most sharks can live only in salt water but in bull sharks, their bodies have adapted to live in both fresh and salt water. 8 8  and hide between green leaves and colourful flowers. *Lizards are from reptiles. * They are an ancient type of animals found 9 all over the world environment. * Bodies of reptiles are covered with scales as starred agama lizard and panther chameleon. 9  Plant adaptation Fresh water s the 10  of water. 11 * It is a grassland habitat with a mild temperature. * Most large plants cannot grow in this habitat, due drought. s fat in its hump. them in water, While soaking up to absorb sunlight to make food. around the leaves, to prevent animals from eating these leaves. them in the wind to warn the other nearacacia near acacia trees to produce the same poison. 12  * It is rainy most of the year and characterized by strong winds. * It is hard for some plants in this habitat to reach sunlight due to the extra tall trees growing up to 70 meters tall.  (in the wet muddy).  Seeds they are fully yellow seeds to be easily carried by wind across the forest. 13  Digestive system *System: is a group of organs that work together to perform a specific function. * Digestive system and respiratory system are working together to get energy from food and breathing. *Digestion process: is a process of breaking down food into smaller parts that the absorb and use them to get energy and grow. Importance of food: 1- Food contains different nutrients as (vitamins , proteins that give us energy to: a- Do activates and body function. 14 15 *The walls of small intestine absorb these nutrients through tiny blood vessel. * The body does not benefit from some parts of food (undigested materials) that flow into the large intestine. S There is no digestion process occurs in the large intestine. 16  (respiration).  It is a process of pulling air in (inhalation) and pushing air out (exhalation) of the body. 17 17 18 18 19  How fish breathe Blood vessels in the gills : and release carbon dioxide. *Gills in fish are found under bony flaps that open and close. *Gills are unique structural adaptation that allow fish to breathe under water. 20 21  Human change the environment Human activities: cause changes in the ecosystem and negatively affect the nature, so organisms will have to adapt these changes to survive. Examples of human activities: 1- Cutting down forests. 2- Farming and clearing lands. 3- Building communities instead 4- Air pollution that is caused due of grasslands. to exhausts from cars and some factors. 22 5- Water pollution that is caused 6- introducing plants and due to bad habits as throwing animals into the environment waste to waterways and soil. that were never part of the ecosystem. Note: changes resulted from human activities can cause the disappearance (extinction) of plants and animals that once lived in an environment. Give reason for: Although the air, water and soil get polluted as a result of human activities, plants and animals can survive. Some animals can survive by moving to another ecosystem to find what they need. Plants depend on their seeds to land in better place for them to survive and grow. 23  ,water and air pollution : make the crops can't grow. The negative effects of human activities : diseases. 24  Amphibians that live in water and land such as: 25 26 Concept (2) (1.2) Sense at work 27 28  to recognize friends. 29 28 Echolocation depends on echo to determine the location of other living organisms and objects in the water. in the form of echo. 3. Echo helps the dolphin to locate its prey and other objects. 30 29  SENSORY ORGANS OF NOCTURNAL ANIMALS 1 sharp 2 It has large eyes. with To direct distant sounds into the feathers in its head. owl's ears. 3031 Both bats and dolphins use echolocation to find their food. It is branched into smaller and smaller nerves. 32 31 33 32 34 33 34 3335  Both human and jerboa avoid danger by relying on sensory receptors, nerves and a brain to sense and communicate messages and they move away quickly from danger. 35  Jerboa hops in zigzag, so it can escape quickly from danger.  Human moves quickly his hand away, when it touches the spines of cactus plant. 36 34 4 message 36 35 on nervous system works 37 36 Concept (5) How animals use communication systems. 38 37 Note: High pitched sound such as: the sharp voice of a woman. Low pitched sound such as: rough voice of a man. 39 38  Technology inspired by nature Bats use sound and their ears in: 1-Communicating with each other. 2- Getting information about their surroundings using their hearing sense. 40 39 40 41  Concept (3) Light and sight Can you explain as: fishing cat Human see objects less clearly in dim (low) light Human need a source of light to see objects clearly. Fishing cat is a wild cat that hunts for food at night. Fishing cat is a wild cat that hunts for food at night. 41 42 Light: is a visible form of energy that travels in the form of waves. and doesn't emit its own light. 4- Structures in human eyes transmit messages to the brain. 5- Brain forms a picture about what we see. 42 43  Nocturnal animals To allow more light to enter their eyes to see well at night. and touch. 44 43 2 Light reflection 45 44 They don't have shadows. They have shadows. Glass- Human- clothes- skin – moon- s. 46 45 Give reason: Shadow is formed when light falls on an opaque object. Because light is absorbed or reflected and can't pass through it. s. (in one direction) 47 46 Concept (3) Lesson (3) they live on: Fireflies are not flies, they are winged beetles. What happens if: There is another group of fireflies flashing nearby. 1- Fireflies will stop flashing their own patterns. 2- They will start to match the pattern of the other group. Human can use light to communicate such as: 1- Traffic light 2- Lighthouses are used to guide ships. There are some similarities and differences between human and animals in communication and transferring information. Humans Both Animals - Writing - Displaying light. - Echolocation - Reading - High pitched - Language sound. - TV - Cell phones - An electronic reader. 48 47 Lesson (4) : Transferring information We use our senses of sight, touch, taste, hearing and smell to: 1- Collect information about the environment around us. 2- Communicate or share information with others. Your ears detect sound energy. Your eyes detect light energy. Examples of information that the eyes receive. get help. In the past humans used signals fires to communicate from a distance. 49 48  5- Music or sounds encode messages. 6- Lighthouses encode information in flashes to tell sailors where they are. - Sense organs receive information and send it to the brain. - The brain decodes and interprets the50meaning. 4954  Unit (2) Concept (1) Starting and stopping Can you explain?  Static objects require a force to move them.  Forces could be pushing or pulling forces. ……………..…. ………………. ………….. …………..  For static object to move, the forces acting on it need to change.  The player needs energy to push the ball.  The boy needs energy to pull the bag. 51 50  52 51  How things move (Pulling or pushing) An object doesn't move when no force acts on it.  Air force (blowing wind): it can move some objects, such as: leaves of trees. How did engineers prove that air causes movement ? 1- Engineers attached a fire extinguisher to a static cart. 2- When air is released backward from the extinguisher the cart begins to move forward. 3- By increasing the number of extinguishers the speed of The car increases and it covers 53 a longer distance. 56 52 54 53 Unit (2) Lesson (2) Tug of war game If there are unbalanced forces acting on an object, this object will move. If there are balanced forces acting on an object, this object will not move. 5455 relative to a fixed point. 55 56  pulls downward. 57 56  Force  The world around us is in a constant motion.  Some things move quickly, while others move slowly.  All motion, fast or slow is caused by force. 58 57 Unit (2) Lesson (3) Because the wall applied a force to the car with the same amount and in the opposite direction. It is the force that is exerted when objects rub against each other. 59 58 Rolling cars 59 60  4 Energy, work and force Force: it is the effect that affects an object and changes its state. Force transfers energy from one object to another. Force : is something that changes energy so that it can do work. Work : is the energy transferred by a force to move the object. 6061  Unit (2) Concept (2) Energy and motion ( moving energy ) It helps us in operating electric devices. 62 61 4 It helps us in cooking. 5 It helps us in operating electric devices. Examples: when a football player kicks the ball: 1- The ball on the ground has no energy. 2- Kinetic energy transfers from player's foot, So the ball moves. 3- The ball moves in the air because it gains kinetic energy. 4- Kinetic energy transfers from the ball to the goal net which vibrates. 62 63  Static objects have no kinetic energy. s kinetic energy. When an object moves up a When an object moves down hill, it stores potential energy. a hill, it potential energy changes into kinetic energy. Static object on the ground has no energy. 6364 6465 66 65 6766  Lesson (2) : Energy basics When the boy pushes the box: 1- The boy needs energy to move the box. 2- The boy exerts pushing force on the box. 3- When the box moves, work is done Energy: It is the ability to do work or to make things happen. Work: It is the force that causes an object to move. Energy can be stored and changed from one form to another. Ex. Roller coaster. Most forms of energy can't be seen. Ex. Heat energy – sound energy – chemical energy – electrical energy The work done by energy can be seen and measured Ex. The goal net vibrates because kinetic energy transfers 68 From the ball to it. 67 As the speed increases, the kinetic energy increases. Potential energy means that an object is ready to do work or to be active. 69 68  Forms of potential and kinetic energy Kinetic energy depends on: speed and mass 70 69 A battery stores chemical potential energy, this energy isn't used until the battery is connected to any device. 7071 Energy is found everywhere around us. Energy can be changed from one form to another. Energy transferred from an object to another.. 72 71 7273 73 74 7475 Unit (2) Concept (3) Speed 7576  77 76 77 78 Basics of speed 79 78 7980 8081 81 82 82 83 52  3 84 83 84 85 86 85 85 87 86  88 87 8889 By increasing the force on an object, and damage will happen to the object. 89 90  The truck has big mass, big engine, high kinetic energy, consumes more fuel, causes more damage during collision. The car has small mass, small engine low kinetic energy, consumes low fuel, cause less damage during collision 9091  Heavy objects have high kinetic energy causing more damage. Low objects have low kinetic energy causing less damage. How can you play a game with marble : Kinetic energy is transferred from your hand to the 1st marble then to the 2nd one and s Some of the kinetic energy is converted into sound energy, so we hear a click sound during collision. Energy transformation in Newton's Cradle : When the ball is raised up: The ball stores potential energy. When the ball is left to move: Potential energy decreases gradually and it is converted into kinetic energy. When the ball hits the 1st ball next to it : Kinetic energy transfers to the 1st ball, then to the rest of the balls. Some of the kinetic energy is converted into: 1- Sound energy (due to the collision between the balls). 2- Thermal (heat) energy (due to the friction between strings and other parts of cradle and between the air and the balls during their motion. 91 92  In Newton's Cradle : The distance moved by the The distance moved by the moving balls on the right side. moving balls on the left side. The amount of energy before The amount of energy after collision. collision. The number of moving balls on The number of moving balls on the right side. the left side. Note: Energy is transferred and converted into other forms, but it can't be destroyed. Kinetic energy travels in two opposite directions among moving balls. 9293 94 93  Geel 2000 Language Schools Science Department Worksheets with models answers Primary (4) First term (2023 – 2024) 1 Worksheet (1) 2 3  7- Choose: 1- Adaptation helps living organisms in all the following characters except… (a) Surviving (b) hiding (c) death 2- If a desert lizard is transferred into a cool environment, it will stop………. (a) Looking for water to drink (b) breathing (c) Looking for shade area (d) eating 3- When chameleon touches a blue flower, it blend with this color which A type of ……………. (a) Sleeping (b) breathing (c) camouflage 4- The behavioral adaptation that helps the animals protect itself from enemies……………. (a) Blend in (b) extinction (c) immigration 5- ………………. are panting to lower its body temperature. (a)Whales (b) lions (c) foxes 6- Animals that live in a hot environment have …………….ears to cool their bodies. (a) small (b) short (c) long. 8-What happens when……? One of the organs of the digestive system of human is absent. …………………………………………………………………….. 9- Some dogs live in a cold environment, while others live in a hot environment, in your opinion, which one has a thick fur? And why? 4 Worksheet (2) 5 Worksheet (3) 6  2- Choose: 1. The roots of palm trees help them to ………. (a) Stand strong against the wind (b) reach underground water (c) Fix the tree in the soil (d) all are correct 2. The cactus plant has spines that protect it from being eaten by desert animals, and this is considered a form of …………… (a) Behavioral adaptation (b) structural adaptation 3. Mangroves tree grow in……………… (a) Fresh water (b) salt water 4. Barbary fig keeps animals away like acacia trees by its ……….. (a) Smell (b) sharp spines (c) poison 5. Umbrella-shaped tree are ……….. (a) Mangrove tree and acacia tree (b) Mangrove tree and kapok tree (c) Acacia tree and kapok tree. 6. Acacia tree trunk and camel hump………. (a) Both store water (b) both store fat (c) The first stores water, the second stores fat. 3- What happens if ……? A plant is taken from its original environment and placed in another different environment. …………………………………………………………………………….. 7  Worksheet (4) B- What happens if: One of the organs of the digestive system is absent. …………………………………………………………………………………………………………….. 8 Worksheet (5) 9 10 11 3- Label the organ of the respiratory system: 12  Worksheet (6) 1- Correct the underlined words: 1-Fish use gills to take carbon dioxide gas out of the water. (…………………….) 2- Fins in fish are found under bony flaps that open and close. (…………………….) 3- Air enters the mouth of a fish and then passed across the gills. (…………………….) 4-Gills are unique behavioral adaptation that allow fish to breathe under water. (………………….…) 2-Write the scientific term of each of the following: 1- A gas which the human and fish bodies must get rid during exhalation process. (…………………………………) 2- A kind of pollution that is caused due to throwing waste into Waterways. (……………….………………) 3- What happens if…….? 1-The exhausts from cars and factories increase in big cities.. …………………………………………………………………………………………………………………………………………………… 2-The ecosystem of amphibians is containing clean air and water. …………………………………………………………………………………………………………………………………………………… 3-Amphibians have gills only to breathe. …………………………………………………………………………………………………………………………………………………… 13  Worksheet (7) 1-Match column (B) to column (A) A- is active at night. 1.Light B- it depends on the echo of the sound in locating the 2.Owl prey. C- An animal with a bowl like face and strong senses 3.Nocturnal animal of hearing and vision. D- It is the visible form of energy that is transmitted 4.The bat in the form of waves. E- A structural adaptation in the eye that provides 5.Hearing some animals with better vision at night. F- A sense that helps us hear birds. 6. mirror like membrane A. ……. B…….. C…….. D……. E………. F………. 2-Write the scientific term of each of the following 1-The time taken by an organism’s body to react to different stimuli around it. (……………………) 2- The form in which the information messages transmit through nerves form the sensory organs to the brain. (…………..…………) 3- Special type of nerves found in sensory organs and responsible for sending messages to the brain. (…………..…………) 14 3- Complete the following sentences: 1- The …………is the organ that sends information to the brain when you smell the scent of a nice perfume. 2- The response of the eye nerves is ………….. than that of the ear nerves. 3- Hopping of the Egyptian jerboa in zigzag patterns to stay away from the snakes attacking it is considered as a………….adaptation. 4- Owl can detect the places of their preys by using the super senses of ……….……….. and……………… 4- Put (√) or (X): 1- A dolphin produces sound waves through its ears so it can locate its prey. ( ) 2- It is difficult for a dolphin to be a prey of the owl. ( ) 3- The owl uses the sense of touch to hunt its prey at night. ( ) 4- A dog uses its sense of smell and eyesight to identify its owner. ( ) 5- Nerves are an important part of the digestive system. ( ) 15  Worksheet (8) A- Cross the odd word: 1- Texting – sending an email – Echolocation – writing. (……………….) 2- Bats – Humpback whales – Dolphins – Ants. (…………………………) B- Complete the following words between the brackets: 1- Ants depend on their sense of………….to communicate. (smell – sight ) 2- Humpback whales communicate by their sense of……. (hearing – sight) 3- In a blind person's cane, the echo is turned into…..(flashlight – vibrations) C- Write the scientific term: 1- A place where groups of ants perform different roles. (……………..) 2- Ants send a smelly message to alert the scout ants to search for food. (……………………….) 3- A special device that is used by a blind person to locate things nearby. (……………………………………….) D- Give reason: 1- Humpback whales sing different songs. ………………………………………………………………………………… 2- The solider ants use smells in their communication. ………………………………………………………………………………… D- What happens if: 1- The amount of food in ant's colony becomes low (decreases). ………………………………………………………………………. 2- The high pitched sound that is produced by the blind person's 16  cane hits an object. Worksheet (9) Fishing cats depend on the reflection of…………………waves. Sound b) light c) heat d) chemical Vision occurs due to the………………..of light. deflection b) refraction c) reflection d) structural B- Give reason: 1- Although the moon is shiny, it is not a source of light. ……………………………………………………………………………………….. 17 2- A fishing cat's eyes seem to glow in the dark. …………………………………………………………………………………………… 18 Mirror a. Can locate their preys in dark water. Dolphins 19  Worksheet (10) A- Choose the correct answer: 1- Light travels in ……………….lines. a- curved b- zigzag c- straight d- opposite 2- ………..is an example of light reflecting material. a- wood b- mirrors c- plastic d- papers 3- All the following materials are opaque, except………… a- wood b- the human body c- iron d- water 4- …………..allows light to pass through it. a- the moon b- rock c- glass d- wood 5- When light falls on a dark surface,…………………. a- the surface absorbs the light. b- nothing happens c- the light refracted. d- the light passes through it. 6- All the following are rough surfaces, except………………. a- mirror b- clothes c- wood d- paper B- Complete from the following: 1- When light falls on an opaque object, a………is formed. (rainbow – shadow ) 2- You can see a ball found inside a…………box. (glass – wooden ) 3- …………is a transparent liquid material. (air – water ) 4- A rough surface………….the light rays falling on it. (scatters – collects) 5- The mirror like membrane in the cat's eyes is a………….surface. ( rough – smooth) 20 6- Shadow is formed when light falls on a……… (glass – tree ) C- Write the scientific term: 1- The bouncing of light rays when they fall on a reflecting surface. (…………………………………….) 2- Materials that don't allow light to pass through. (………………….) 3-They are surfaces that reflect the light rays in one direction. (……………..) 4- A dark area that is formed when light falls on an opaque object. (………..) D- Give reason for: 1- Water is a transparent material. ………………………………………………………………………………… 2- You can see your image in a mirror. ……………………………………………………………………………….. E- What happens when: 1- Light rays fall on a paper. ………………………………………………………………………………… 2- Light rays fall on opaque object. ………………………………………………………………………………… 21  Worksheet (11) A- Complete from the following: 1- Fireflies light up due to a……………reaction in their bodies. ( physical – chemical ) 2- The ability of fireflies to light up is a……………adaptation. (structural – behavioral ) 3- Fireflies depend on their sense of……………to communicate together. (hearing – sight ) B- Write the scientific term: 1- It is a kind of beetles that light up their wings. (……………..……….) 2- It is a living organism that communicates by cell phones. (……………….) 1- Firefly 2- Human C- Cross the odd word: 1- Traffic lights – reading – lighthouses - echolocation. (………………..….) D- Give reason for: 1- Fireflies light up their wings. ………………………………………………………………………………… E- What happens when: 1- There is another group of fireflies flashing nearby ? ………………………………………………………………………………… 22  Worksheet (12) A- Complete from the following: 1- ………..is a code in the form of sound that humans can communicate. (writing – language) 2- The tones of musical instruments can be detected by……………. (eyes – ears) 3- Different languages are considered………………... (codes – lights) B- Choose from column (A) what suits it in column (B): 1- (………) 2- (……….) 3- (…..….) 4- (………) 1- c 2- a 3- d 4- b C- Give reason for: 1- The light of lighthouses is very important for sailors. ……………………………………………………………………………… D- What happens if: 1- You see the red traffic light. ……………………………………………………………………………… 23  Worksheet (13) (A ) Write the scientific term of each of the following: 1- A force that you make to change the direction of an object towards you. (……………………….) 2- A force that you make to change the direction of an object away from you. (………………………) 3- It is a push or pull that is applied to an object causes it to change its position. (……………………….) 4- It is a force that is exerted when objects rub against each other. (……………………….) (B) Look at the opposite figure, then answer the following question: 1-In the opposite figure what happens if we increase the number of fire extinguishers fixed on the cart. 3- The following figure shows two similar toy cars, study the figure then answer the questions below: Which of these two cars is affected by a greater force? (Give a reason for your answer). 24 (c) Put (√) or (x): 1-Lifting a book upward needs more energy than pushing a truck. ( ) 2-You need energy to push a car forward or backward. ( ) 3-Using a remote control of television needs a pushing force that acts on its buttons. ( ) 4-When a car crashes into a wall, it will not stop. ( ) (D) Give a reason for the following: 1-The shockwave truck is faster than the normal truck. 2-Anybody moves on the ground is usually affected by a force opposes its direction of movement. 3-If a ball moves on the ground, its speed decreases till it stops. 25 E- Complete the following sentences using the words below: (Friction – balanced – opposes – unbalanced) 1- Any object moves from its place when the forces acting on it is……………… 2- The force that slows down or stops motion is called……………… 3- Friction is a force that ……………… motion. 4- When a book is lying on a table without moving, the forces acting on it are ……………. F-What happens if …..? A jet engine is placed in a normal truck instead of its normal engine. …………………………………………………………… 26  Worksheet (14) (A ) Complete the following from the words between the brackets: 1- To exert a force on an object………..is needed. ( work – energy) 2- To stop or start moving an object,……..is required. ( sound – force) 3- When work is done, there is……………of energy. (B ) Write the scientific term: 1- It is the effect that affects an object and changes its state. (…………………………………) 2- It is the energy needed to move an object by applying a force on it. (…………………………………) (C ) Give reason for: 1- The boy who pushes the wall doesn't do any work. ………………………………………………………………………………….. 2- The boy who pushes the car does work. ………………………………………………………………………………… 27  Worksheet (15) A-Complete from the words between brackets : 1. On the top of the ramp, ………….energy is zero. (potential –kinetic ) 2. On the top of the ramp, …………..energy is maximum. ( potential – kinetic ) 3- On kicking a ball………energy transfers from your foot to the ball. (potential – kinetic ) B-Write the scientific term of each of the following: 1- The form of energy that the object has due its movement. (………………………..) 2- The energy that is used to operate all electric devices. (……………………….) 3- It is the stored potential energy in a compressed spring. (………………………) 4- The energy that is stored in both the human food and car fuel. (………………………) C- Correct the underlined words: 1- When an object moves down, it has more active form of energy known as potential energy. (………………………) 2- Kinetic energy is used in cooking food. (……..………………..) 3-A car battery stores a form of kinetic energy known as chemical energy. (………………………) 28 D- Choose the correct answer: 1-When an object moves down a ramp, its stored energy…………. a. Increases. b. Doesn’t change. c. Changes to a less active form of energy. d. Changes to a more active form of energy. 2- All the following energies cannot be seen, except………………. a. Thermal energy. b. Electrical energy. c. Light energy d. Sound energy. 3- All the following examples store chemical energy, except………….. a. Food. b. Natural gas. c. A battery. d. A compressed spring. 4- When the ice-skater jumps high, the force affecting the skater must be… a. Balanced. b. Unbalanced. c. Created. d. Destroyed. E-What happens if ……? 1- A roller coaster moves from up to down. (According to its energy). ……………………………………………………………………………… 2- A roller coaster stops. (According to its energy). …………………………………………………………………… 29  Worksheet 16) A- Choose from column (B) what suits it in column (A): (A) (B) 1. Chemical energy a. is changed into kinetic energy in the car engine. 2. Kinetic energy b. is decreased by increasing the speed. 3. Potential energy C. is increased by increasing the speed. d. is the produced energy from a battery. 1-………….. 2-……………. 3-…………… B- Choose the correct answer: 1- The source of energy in a robot is …………… a. Electrical energy. b. Solar energy. c. Thermal energy. d. Chemical energy. 2- Chemical energy can be stored in …………. a. Food only. b. Televisions and food. c. Batteries only. d. a & c. 3- in a …………., chemical energy is converted into light energy. a. gas oven. b. clock. c. flash light. d. normal car. 30  4- an object’s ……………. affect(s) both kinetic and potential energies. a. speed. b. mass. c. height. d. a &b C- Complete from the words between brackets: 1-When you clap your hands, kinetic energy is converted into ………………. ( light – sound ) 2-what kind of energy is stored inside the battery? (chemical energy – heat energy ) 31  Worksheet (17)  Choose the correct answer: 1-When the objects collide with each other,………is transferred them. a) time b) distance c) energy d)nothing 2- A moving ……………. has no engine. a. motorbike b. truck c. bike d. car 3-Collisions usually produce …………. a) Solar energy. b) Sound energy. c) gravitational potential energy. d) chemical potential energy. 4-Airbag is made of ………… a) carton. b) nylon. c) rubber. d) cotton. 5-When a car stops suddenly, the passengers move ………… a) back ward. b) upward. c) forward. d) downward. 6- When the cricket bat hits the ball, the ball direction ……… and the ball speed ……….. a) doesn’t change – doesn’t change. b) doesn’t change – changes. c) changes – doesn’t change. d) Changes – changes. 32  Give reasons for: 1- Seatbelts in cars are very important. ………….. ………………………………………………………………….. 2- Airbags deflate after a collision. ……………………………………………………………………………….. 3-The speed of the ball increases when the bat hits it hardly. ………………………………………………………………………………..  Put (✓) or (x) : 1- Astatic truck has more kinetic energy than a moving car. ( ) 2- During a crash between two cars , the potential energy transfers from the faster car to the slower one. ( ) 3- After car collision , the air bags deflate as fast as they inflate. ( ) 4- Seat belt enables the driver to see the road clearly. ( ) 5- When a fast car hits a very big tree, the kinetic energy of the car transfers into the tree. ( )  Complete the following sentences: 1. During a car crash , the …………… is inflated with a gas to provide a soft cushion. 2. Among safety equipment which are used during collision of cars ………. and …………. … 3. As a result of collision between the ball and the bat the direction of ball will …………….. 33  Worksheet (18)  Choose the correct answer: 1-Which of the following relations can be used to calculate the speed of a moving object? a-Speed = Distance – Time b-Speed = Distance x Time. c-Speed = Distance + Time. d-Speed = Distance ÷ Time. 2-If a bicycle travels 30 meters in 5 seconds, so its speed equals…………….. a-6 km/hr. b- 3 km/hr. c- 7 km/sec. d- 6 m/sec. 3-the result of dividing the distance traveled by time equals………… a-the energy b- the force c- the mass d-the speed 4-kinetic energy isn’t affected by the object’s…………. a-mass b- speed c-color d-weight Complete the following sentences: 1. To calculate the speed of a body that moves down a ramp, we need to know the …………. of the ramp and the ………… taken to reach the end point of the end point of this ramp. 2. If you walk from your school to your house, you will take a ………………. time than if you ride a bicycle to travel the same distance. - Problems: 1-Calculate the speed of a train that travels a distance equals 200 kilometers in 4 hour. ………………………………………………………………………………… 34 2- If your school is 3 kilometers away from your house and it took 1 hour to walk there, calculate your rate of speed. ……………………………………………………………………………… 3- If a bus traveled 600 kilometers in 6 hours, calculate the average of the bus speed. ………………………………………………………………………………  Complete the following sentences: 1- When two cars collide with each other, some of transferred energy may be in the form of heat,…………. and …………. 2- A car covers 80 meters in 4 seconds, so it moves at a speed equals……….. m/sec 3- A car with speed =100km/hr., Its kinetic energy is …………. Than that of another car with speed =60 km/hr. 4- Speed is a ……………. quantity. 5- The speed of two objects is equal, if they cover the same …………. at the same……………  Choose the correct answer: 1. What happens when a driver presses the brakes and stop suddenly? ……………….. a) The passenger moves back ward b) The passenger moves forward c) The passenger remains stable d) No correct answer 2. How can we calculate speed ? ………… a) Time / Distance b) Distance/ time c) Mass / time d) Distance/ mass 35 3. An object keeps moving with same speed when ……………. a) Its kinetic energy decreases. b) Its potential energy increases. c) No another force stops it. d) Another object collides with it. 4. When two cars moving in opposite directions collide, the ………. a) Energy of the fast car is more and causes more damage b) Energy of the fast car is small and causes less damage. c) Energy of the low car is more and causes more damage d) Energy of the small car is small and causes less damage 5. If two objects collide together, the energy before collision is …………. The energy after collision. a) equals b) more than c) less than d) greater than Write the scientific term for each of the following: 1. The process in which two objects or more crash into each other and includes on energy. ( ………………….) 2. One of the factors that affects the kinetic energy. ( ………………….) 3. It is a measurement of how fast something is moving. (…………………..)  Put (✓) or ( x): 1. Speed is measuring how or hot or cold something is. ( ) 2. Drivers should drives as fast as possible to avoid accident. ( ) 36  3. If a car covered a distance of 10 m in a time of 2 second, so the speed of the car is 5m/sec. ( ) 4. Kilometer/hour is the only measuring unit of speed. ( ) 5. A heavier object causes more damage than a lighter object. ( ) Worksheet (19)  Choose the correct answer: 1-When a person is riding his bike at high speed and hits an empty litter box, which of the following is the expected effect after collision? a-The box moves. b-The speed of the bike increases. c- The speed of the bike decreases. d-A and C. 2-If a motorcycle hits an adult pedestrian in the street , it may cause …… a-Slight injuries , due to the high- speed b-Severe injuries, due to the low -speed c-Severe injuries, due to the high – speed d-No correct answer 3-Fast moving objects, …………………. a-Produce great kinetic energy b-Cause more damage during a collision c- Consumes more fuel 37 d-All the previous answer 4-In newton’s cradle , the balls stop , due to………… a-The friction between the string and other moving parts b-the kinetic energy is converted into sound energy. c- Some energy is lost ,when the balls pass through the air d-All the previous answer 5-In newton’s cradle, kinetic energy is converted into …………….. a-Light energy b-Thermal energy c-Sound energy d-B and C 6-During a collision, all the following happen, except ……………… a-energy transfer b-energy changes c-energy is destroyed d-damage takes place 7-The kinetic energy of a vehicle increases when ………………. a) Its speed decreases b) Its Mass decreases c) Its mass and speed increase d) No correct answer 8-Which one is the fastest? a) A kid runs 400 meters in 5 minutes. b) A girl rides a bike and covers 400 meters in 2 minutes. c) A kid walks 400 meters in 10 minutes. d) A boy rides a car and covers 400 meters in 1 minute. 38   Put (✓) or (x) : 1. As the mass of an object increases, its kinetic energy increases ( ) 2. When the angle of the ramp decreases, the speed decreases. ( ) 3. During collisions of the Newton’s cradle balls , the amount of kinetic energy remains as it is. ( ) 4. As the speed increases, the amount of fuel used decreases. ( ) 5. The mass of moving body affects its speed. ( )  Complete the following sentences using the given words : ( after – doesn’t disappear – sound energy – before – air – mass – large ) 1-The energy………….., but changes from one form to another 2-In newton’s cradle, an amount of energy is lost in the form of …………… energy. 3-When a collision occurs, the energy…………………collision is equal to energy…………….. collision. 4-When …………….. of an object increases , its kinetic energy increases. 5-Vehicles with……………. Mass cause great damage during collision. 6-In newton’s cradle, the balls lose some energy in …………………. 39   Complete the following sentences using the words between brackets : 1. If a truck ‘s mass is 1 ton , it has …………………. Energy than a 2 – ton truck has. ( More – less ) 2. The relation between the speed of a moving object and its kinetic energy is a/an …….. ……….. relation. ( Direct – inverse ) 3. When the car fuel is completely runs out , the car’s …………………… becomes zero. ( Mass – speed ) 4. When we lift-up the first ball of the Newton’s cradle,………….. energy is stored. ( Potential – kinetic ) 5. The is a/an …………… relation between collision impact and speed. (Inverse – direct ) 40  Model answers Worksheet (1) 1-Classify: - Cold polar regions (Arctic fox-polar bear- penguin). - Hot deserts (camel fennec fox – desert lizard) - Oceans (octopus-bull shark). 2- Adaptation. 3- Camouflage. 4 - 1- it has a tan – colored coat. 2- It has extra – large ears. 5-Give reason: a- Beause waxy layer protects palm leaves from drying out. b- To trap warm air against the skin to keep its body warm. c- Due to the movement of blood in blood vessels through the penguin’s feet. 6-Complete the table: Polar bear: It has white fur to help it blend in with the snow. Brown bear: Forests. Caracal & fennec fox: It has extra-large ears. It has a special shape of ears. Lizards: they have colorful scales that make them hard to see among the rocks. 41  7- choose 1- Death. 2- Looking for shade area 3-Camouflage. 4- immigration. 5- Foxes. 6-Long. 8-What happens if……? The digestion will not complete. 9- The dogs which live in cold environment have thick fur to keep the body warm and adapt with the cold weather. Worksheet (2) Fennec fox Habitat: hot deserts. Structural: 1-Sandy colored fur/ 2-extra-large ears. Behavioral: It lives in burrows. Arctic fox Habitat: Tundra Structural: It has short ears and legs – It has a special shape of ears. Behavioral: It lives in burrows - It eats different kinds of food. Bull shark :Habitat: fresh water & salt water. Structural: Its body is adapted to survive in fresh water. It has a dark and white belly (countershading). It has sharp teeth. Behavioral: It can hunt in different places. It hunts in the day as well as the night. 42  Chameleon Habitat: Tropical rainforest. Structural: It has brightly colored scales. It has a very long sticky tongue. It has v- shaped feet and a tail like a hand. Behavioral: It open its mouth wide. It changes the colors of its scales. Worksheet (3) Table 1 Acacia tree (fennec fox –palm tree- Barbary fig plant- starred agama lizard). Kapok tree (panther chameleon). Table 2 Acacia tree (taproot- tiny leaves). Kapok tree (butter roots – hand shaped leaves). Table 3 Acacia tree (savannah forest – tiny leaves growing). Pine tree (snow – needle leaves) Water lily (wetland – wide leaves) Choose: 1-(d) 2-(b) 3-(b) 4-(b) 5-(c) 6-(c) What happens of ……? This plant may die or may adapt the new environmental conditions to survive and grow in its new environment. 43  Worksheet (4) A-Write the scientific term of each of the following: 1-Stomach 2- Saliva 3-Large intestine 4-small intestine 5-Teeth 6-Tongue 6- Esophagus B-What happens if: 1- The digestive system could not do its function correctly. C- Choose: 1-e 2-d 3-a 4-b 5-c Worksheet (5) Table 1: Inhalation: Moves downward increases oxygen gas Exhalation: Moves upward decreases carbon dioxide gas Table 3: 1-d 2-c 3-a 4-b Table 4: Digestive (anus - stomach - small intestine – esophagus – large intestine liver – pancreas) Respiratory (trachea-lungs-diaphragm-nose) 44  Write the scientific term of each of the following: 1- Mouth. 2- Saliva. 3- Respiration process. 4- Stomach. Label the organs of the Digestive system Mouth – Esophagus – Liver – Stomach – Small intestine – large intestine Write the name of these organs Large intestine Stomach Small intestine Mouth Esophagus Label the organs of the respiratory system 1-Throat 2-Trachea 3-Lungs 4-Diaphragm Worksheet (6) 1-Correct the underlined words: 1- Oxygen. 2- Gills. 3- Water. 4- Structural. 2- Write the scientific term of each of the following: 1- Carbon dioxide gas. 2- Water pollution. 45  3-What happens if……..? 1- Air pollution occurs. 2- Amphibians will survive and their number increases. 3- They can live only underwater. Worksheet (7) Table (1) A-3 B-4 C-2 D-1 E-6 F-5 2-Write the scientific term of each of the following: 1-Reaction time. 2-Electrical impulses. 3-Sensory receptors. 3- Complete the following sentences: 1- Nose 2- Fasters 3- Behavioral 4- Eye sight and hearing. 4- Put (√) or (x): 1 (x) 2 (√) 3 (x) 4 (√) 5 (x) Worksheet (8) A-Cross the odd word: 1- Echolocation 2-Ants 46 B- Complete the following words between the brackets: 1- Smell 2- hearing 3- vibrations C- Write the scientific term: 1- colony 2- Nurse ants 3- A blind person's cane D- Give reason: 1- To communicate with each other in different seasons. 2- To communicate with each other ants if there is a danger nearby. D- What happens if: 1- The nurse ants will send a smelly message to the scout ants to alert them. 2- It bounces back to the cane in the form of echo which is turned into vibrations. Worksheet (9) 1- Choose: 1-b 2-a 3-b 4-b 5-b 6-a 7-b 8-c B- Give reason: 2-Write the scientific term of each of the following: 1- Eyes 2-Mirror like membrane 3-Brain 4-Moon 5-Stars 6-Light 7-Eye 8-mirror 9-Nocturnal animal 3-Look at the following figures then answer: a- Smooth surface because the rays will reflect at the same angle. 47  b- Rough surface because the rays will reflect in different directions. c- Straight line. B- Table (1) 1-d 2-c 3-b 4-a C- Table (2) 1- b 2- d 3- a 4- a B- Give reason: 1- Because moon doesn't emit its own light, but it reflects the sunlight falling on it. 2- Because fishing cat's eyes have a mirror like membrane that reflects any light falling on it. Worksheet (10) A- Choose the correct answer: 1- straight 2- mirrors 3- water 4- glass 5- The surface absorbs the light. 6- mirror B- Complete from the following: 1- shadow 2- glass 3- water 4- scatters 5- smooth 6- tree C- Write the scientific term: 1- Light reflection 2- Opaque materials 3- Smooth (shiny ) surfaces 4- Shadow D- Give reason for: 1- Because water allows most of light to pass through. 2- Because mirror is a smooth surface that reflects light rays in one direction. 48 E- What happens when: 1- Paper scatters light rays in different (many) directions. 2- A shadow is formed. Worksheet (11) A- Complete from the following: 1- chemical 2- structural 3- sight B- Write the scientific term: 1- Firefly 2- Human C- Cross the odd word: 1- echolocation. D- Give reason for: 1- To warn off a predator or to attract a mate. E- What happens when: 1- They change their flash pattern to match that of the nearby fireflies group. Worksheet (12) A- Complete from the following: 1- Language 2- ears 3- codes B- Choose from column (A) what suits it in column (B): 1- c 2- d 3- a 4- b C- Give reason for: 1- Because they guide sailors D- What happens if: 1- The brain will send a response to your muscles to stop moving. 49  Worksheet (13) (A) Write the scientific term of each of the following: 1-Pull. 2-Push. 3-Force. 4-Friction. (B) Look at the opposite figure, then answer the following question: B- 1- It will move faster. B- 2- Car (A) because it travels a farther distance than car (B). C-Put (√) or (x). 1- (x) 2 (√) 3 (√) 4(x) D-1- Because the shockwave truck starts to stop gradually. D-2-Because there is a friction force between the moving body and the ground that acts in the opposite direction of the body movement. D-3- Due to the friction force between the ball and the ground that acts in the opposite direction of ball movement. E- Complete the following sentences using the words below: 1- Unbalanced. 2- Friction. 3- Opposes 4- Balanced. f-What happens if…..? The truck, start moving and reach record speed. 50  Worksheet (14) (A ) Complete the following from the words between the brackets: 1- energy 2- force 3- Transfer (B ) Write the scientific term: 1- Force 2- work (C ) Give reason for: 1- Because the wall doesn't move. 2- Because work is the force applied by the boy to move the car. Worksheet (15) A-Complete from the words between brackets : 1. kinetic 2. potential 3- kinetic B- Write the scientific term of each of the following: 1-Kinetic energy. 2-Electrical energy. 3-Elastic potential energy. 4-Chemical potential energy. 51 C- Correct the underlined words: 1- Kinetic energy. 2- Thermal energy. 3- Potential energy. D- Choose the correct answer: 1-d 2-c 3-d 4-b F-what happens if……? 1-The stored energy in the train is changed into kinetic energy. 1- Its kinetic energy becomes zero. Worksheet (16) A-Table 1-d 2-c 3-a B-Choose: 1-d 2-d 3-c 4-b c- Complete from the words between brackets : 1-sound. 2-chemical energy. Worksheet (17) Choose the correct answer: 1. (c) Energy 2. (c) bike 3. (b) Sound energy 4. (b) nylon 5. (c) Forward 6. (d) Changes – changes 52 Give reasons for: 1. They prevent passengers from moving forward when cars stop suddenly. 2. To let the driver get out of the car. 3. The bat transfers the kinetic energy to the ball. Put ( ✓) or ( x) : 1. (X) 2. ( X) 3. (✓) 4. (X) 5. (X) Complete the following sentences: 1. Airbag 2. Seatbelt – air bag 3. Change Worksheet (18) Choose the correct answer: 1-d 2- d 3- d 4- c Complete the following sentences: 1-Distance - time. 2-longer - Problems; 1-Speed =Distance ÷ time Speed=200÷4 Speed= 50 km/hr. 2- Speed =Distance ÷ time Speed=3÷1 Speed=3km/hr. 3- Speed =Distance ÷ time Speed=600÷6 Speed=100km/hr. 53  Worksheet (19) Complete the following sentences: 1. Light – sound 2. 20 m/sec 3. More 4. Physical 5. Distance Choose the correct answer: 1. The passenger moves forward 2. Distance/ time 3. No another force stops it 4. Energy of the fast car is more and causes more damage. 5. Equals Write the scientific term for each of the following : 1. Collision 2. Object’s mass, speed or angle of inclination 3. Speed Put (✓) or (x) in front each sentence: 1.( X) 2. ( X) 3.(✓) 4.( X) 5.( ✓) 54 Choose the correct answer : 1. (d)A and C 2. (c)Severe injuries, due to the high speed 3. (d)All previous answers 4. (d)All previous answers 5. (d)B and C 6. (c)energy is destroyed 7. (c)Its mass and speed increase 8. (d)A boy rides a car and covers 400 meters in 1 minute. Put (✓) or (x) : 1. (✓) 2.(✓) 3.(X) 4. (✓) Complete the following sentences using the given words: 1. Doesn’t disappear 2. Sound energy 3. Before – after 4. Mass 5. Large 6. Air Complete the following sentences using words between brackets : 1. Less 2.Direct 3.Speed 4.Potential 5.Direct 55