Physics Grade 9 Block 3 Content PDF

Physics  Physics Grade (9) Block (3) Content Unit (3): Energy Stud sheet From P 2 Till P 20 Worksheet From P 22 Till P 52 Page 1 of 52 Subject Grade Date Block week...

Physics  Physics Grade (9) Block (3) Content Unit (3): Energy Stud sheet From P 2 Till P 20 Worksheet From P 22 Till P 52 Page 1 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Describe the effect of heat on the motion of the particles Objectives: Define and explain the thermal expansion The kinetic particle theory explains the properties of the different states of matter. The particles in solids, liquids and gases have different amounts of energy. They are arranged differently and move in different ways. Particles arrangement and movement When materials are heated, they expand This expansion happens because the molecules start to move around (or vibrate) faster, which causes them to knock into each other and push each other apart Note: When this happens, it is the space taken up by the molecules that increases. The molecules themselves remain the same size. Thermal expansion occurs in solids, liquids and gases When temperature of matter is increased; o Solids will tend to expand the least o Gases expand the most o Liquids fall in between the two Page 2 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Describe the effect of heat on the motion of the particles Objectives: Define and explain the thermal expansion This behavior is influenced by the distances and strength of the forces between particles in each state Molecules do not expand, but the space in between them does o When solids, liquids and gases are heated:  Summary As heat is added. 1. The increase in temperature... 2. Leads to an increase in kinetic energy, so that... 3. Molecules and atoms move more quickly... 4. And move apart Page 3 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Explain in qualitative terms some examples for the thermal expansion in solids, liquids and gases e.g. Thermometers, fitting parts of a Objectives: machine tightly together, Removing tight lids, Bimetallic strip, joints on roads and electrical cables List examples for thermal expansion in solids liquids and gases USES & CONSEQUENCES OF T HERMAL EXPANSION 1-Fitting the iron rim on the wooden wheel: The radius of the iron ring is slightly less than that of the wooden wheel. therefore, cannot be easily slipped on to the rim of wooden wheel. first heated to a higher temperature so that it expands in size and the hot ring is then easily slipped Over to the rim of the wooden wheel. Cold water is poured on the iron ring so that it contracts in size and holds the wooden wheel tightly 2-Loosening the metal lid of a glass jar: If the lid of a glass jar is tight. holding it under hot water for a short while or pouring hot water over the lid will make it easier to open. 3-Railwav tracks : While laying the railway tracks on wooden plank, a small gap is left between the successive lengths of rail so gap is left, the expansion of rails due to rise in temperature in summer will cause them to bend sideways which may cause derailment. 4-Electric cables and telephone wires: Telephone wires and cables contract on cold days and sag in summers. To solve this problem, we leave wires slack so that they are free to change length. Page 4 of 52  Grad Dat Subject Block week Unit/Lesson e e Study Sheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Explain in qualitative terms some examples for the thermal expansion in solids, liquids and gases e.g. Thermometers, fitting parts of a machine tightly together, Removing tight lids, Objectives: Bimetallic strip, joints on roads and electrical cables List examples for thermal expansion in solids liquids and gases Expansion in liquid 1-Thermometers rely on the expansion of liquids to measure temperature A liquid-in-glass thermometer relies on the expansion of liquids to measure temperature It consists of a thin glass capillary tube containing a liquid that expands with temperature o At one end of the tube is a glass bulb, containing a large volume of the liquid which expands into the narrow tube when heated o A scale along the side of the tube allows the temperature to be measured based on the length of liquid within the tube Note Consequences of thermal expansion The expansion of solid materials can cause them to buckle if they get too hot This could include: o Metal railway tracks o Bridges Objects that are prone to buckling in this way have gaps built in to creates space for the expansion to happen without causing damage Page 5 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 2 Unit 3-Lesson 2 -Thermal conduction Objectives: Develop a model of conduction at the particle level. Thermal conduction Conduction is the main method of thermal energy transfer in solids Conduction occurs when: Two solids of different temperatures come in contact with one another, thermal energy is transferred from the hotter object to the cooler object Metals are the best thermal conductors o This is because they have a high number of free electrons Conduction can occur through two mechanisms: o Atomic vibrations o Free electron collisions When a substance is heated, the atoms, or ions or particles, start to move around (vibrate) more o The atoms at the hotter end of the solid will vibrate more than the atoms at the cooler end o As they do so they collide, transferring energy from atom to atom passing heat energy to next particles o These collisions transfer internal energy until thermal equilibrium is achieved throughout the substance o This occurs in all solids, metals and non-metals alike Page 6 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 2 Unit 3-Lesson 3 -Thermal Convection Explain convection on a particle level (including specific Objectives: reference to density) Thermal Convection Convection is the main way that heat travels through liquids and gases o Convection only occurs in fluids o Convection cannot happen in solids Density & Convection Descriptions of convection currents always need to refer to changes in temperature causing changes in density o The temperature may fall or rise, both can create a convection current When a liquid (or gas) is heated (for example by a radiator near the floor): o The molecules push each other apart, making the liquid/gas expand o This makes the hot liquid/gas less dense than the surroundings o The hot liquid/gas rises, and the cooler (surrounding) liquid/gas moves in to take its place o Eventually the hot liquid/gas cools, contracts and sinks back down again o The resulting motion is called a convection current When a liquid or gas is heated, it becomes less dense and rises When a liquid (or gas) is cooled (for example by an A.C. unit high up on a wall): o The molecules move together, making the liquid/gas contract o This makes the hot liquid/gas denser than the surroundings o The cold liquid/gas falls, so that warmer liquid or gas can move into the space created o The warmer liquid or gas gets cooled and contracts and falls down The resulting motion is called a convection current Page 7 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 2 Unit 3-Lesson 3 -Thermal convection investigate in practical context the convention in gases as ways by Objectives: which energy can be transferred from an object 1. Convection in liquid A simple demonstration of convection in liquids involves taking a beaker of water and placing a few crystals of potassium permanganate in it, to one side. When the water is heated at that side, the potassium permanganate will dissolve in the heated water and rise along with the warmed water, revealing the convection current Page 8 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 2 Unit 3-Lesson 3 -Thermal convection investigate in practical context the convention in gases as Objectives: ways by which energy can be transferred from an object 2. Convection in air (a) simply hold your hand above the Bunsen flame. You can easily feel the hot air rising. (b) Use the apparatus shown in the diagram. Light the candle and then hold a piece of smoldering paper or string over the top of the other chimney. The smoke should be pulled down that chimney and rise up the other chimney with the hot air above the candle. What is actually is convection? Convection occurs because the air (or other fluid) is heated, expands, becomes less dense and so rises through the denser colder air Page 9 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 3 Unit 3-Lesson 4 -Thermal radiation Describe materials as absorber, emitter and reflector for radiation Objectives: Explain radiation in terms of a wave and connect between thermal transfer by radiation and the light waves Thermal Radiation What is thermal radiation? All objects give off thermal radiation The hotter an object is, the more thermal radiation it emits Thermal radiation is infrared radiation (part of the electromagnetic spectrum) Thermal radiation is the only way in which heat can travel through a vacuum It is the way in which heat reaches us from the Sun through the vacuum of space Thermal radiation does not need a medium to travel, unlike convection and conduction The colour of an object affects how good it is at emitting and absorbing thermal radiation: Note As an object absorbs thermal radiation it will become hotter As it gets hotter it will also emit more thermal radiation Page 10 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 3 Unit 3-Lesson 4 -Thermal radiation Describe materials as absorber, emitter and reflector for radiation Objectives: Explain radiation in terms of a wave and connect between thermal transfer by radiation and the light waves EFFECTS OF DIFFERENT SURFACES The amount of thermal radiation emitted by an object depends on a number of factors: o The surface colour of the object (black = more radiation) o The texture of the surface (shiny surfaces = more radiation) o The surface area of the object (greater surface area = more area for radiation to be emitted from) Black objects are very good at absorbing thermal radiation, for example black clothes make you feel hotter in sunny weather o Black objects are also very good at emitting thermal radiation, which is the reason that chargers for laptops, and radiators in cars are coloured black - it helps them to cool down Shiny objects reflect thermal radiation and so absorb very little o They also emit very little, though, and so take longer to cool down Page 11 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 3 Unit 3-Lesson 5 -Evaporation Relate the evaporation to cooling effect Objectives: Differentiate between boiling and evaporation Evaporation Evaporation is a change in state of a liquid to a gas It happens; o At any temperature o Only from the surface of a liquid BOILING VS EVAPORATION Boiling is also a change in state from liquid to gas o Boiling happens only at the boiling point of the liquid o The change of state happens all through the liquid (seen as bubbles in boiling water, for example) The molecules in a liquid have a range of energies o Some have lots of energy, others have very little o Their average energy relates to the temperature of the liquid Evaporation occurs when more energetic molecules moving near the surface of the liquid have enough energy to escape o The average energy of the liquid is reduced Therefore, liquids are cooled down o by evaporation Page 12 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 3 Unit 3-Lesson 5 -Evaporation Relate the evaporation to cooling effect Objectives: Differentiate between boiling and evaporation Factors affect the rate of evaporation Increased temperature increases the kinetic energy of the molecules in the liquid o Molecules with more energy are more likely to overcome the intermolecular forces holding them in the liquid state and escape the surface o Therefore higher temperature leads to a higher rate of evaporation Molecules only escape the intermolecular forces of attraction at the surface of the liquid o Therefore a larger surface area leads to a higher rate of evaporation Air movement carries away the water vapor which has just evaporated o This dries the air and allows more water molecules to escape o Therefore increasing air movement (when indoors this is sometimes called draughts) increases the rate of evaporation The rate of evaporation is affected by the following factors: 1. Temperature: The rate of evaporation increases with an increase in temperature. 2. Surface area: The rate of evaporation increases with an increase in surface area. 3. Humidity: The amount of water vapor present in the air is called humidity. The rate of evaporation decreases with an increase in humidity. 4. Wind speed: Evaporation increases with an increase in wind speed. Page 13 of 52 Subject Grade Date Block week Unit/Lesson Unit 3-Lesson 6- Application of conduction, Study Sheet physics 9 3 4 convection and radiation Compare and contrast conduction, convection and radiation, Objectives: at the particle or wave level Application of conduction, convection and radiation 1-Air current close to a radiator Air close to the radiator is heated. It expands, becomes less dense and rises. It is replaced by the cooler, denser air which surrounds it. This air is in turn heated, expands becomes less dense and rises. The process continues, a convection current is set up and heat is transferred through the air and hence 2-Convection currents enable hot air balloons to rise, and also explain why it is often hotter in houses upstairs rather than downstairs. Page 14 of 52 Subject Grade Date Block week Unit/Lesson Unit 3-Lesson 6- Application of Study Sheet physics 9 3 4 conduction, convection and radiation Compare and contrast conduction, convection and radiation, at the particle or wave level Objectives: Relate the features of vacuum flask to the ways of transferring thermal energy 3-Structure of vacuum flask A thermos bottle, which is also called a vacuum flask, is a bottle that keeps hot liquids hot and cold liquids cold. This is also known as a vacuum flask. It is somewhat like a super-insulated container. It has two walls joined at the neck of the bottle. 5-Kettle The heating element is enclosed in a metal tube and electrically insulated when a current flows through the heating element, the water around the element is heated first by conduction Then the heat is spread through the water by convection. The heating element must be covered with water to avoid overheat Page 15 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 4 Unit 3-Lesson 7- Insulating House Discuss the design features of buildings which help keep them at a comfortable temperature Apply and explain examples of insulation that can be used to stop thermal energy moving Objectives: Mention and explain methods for how convection is used to keep buildings cool without air conditioning (e. wind catchers which may be used in combination with a qanat to cool the air) Mention and explain methods to decrease heating due to radiation Insulating House Heat is lost through:  the roof - fit loft insulation  windows - fit double glazing and curtains  gaps around the door - fit draught excluders  the walls - fit cavity wall insulation  the floor - fit a carpet Heat energy is transferred from homes by conduction through the walls, floor, roof and windows. It is also transferred from homes by convection. For example, cold air can enter the house through gaps in doors and windows, and convection currents can transfer heat energy in the loft to the roof tiles. Heat energy also leaves the house by radiation through the walls, roof and windows. Ways to reduce heat loss Cavity wall insulation – foam pumped into the gap between the bricks reduces convection and radiation across the gap. Pockets of air in the foam reduce heat transfer by conduction. Loft insulation – a thick layer of fiberglass wool laid out across the whole loft floor reduces conduction and radiation. Double glazing – two layers of glass with a vacuum in between them, reduces heat loss by conduction and convection. Draught-proofing – strips of foam and plastic around doors and windows reduce heat loss due to convection. Hot water tank jacket – lagging such as fiberglass wool reduces conduction and radiation. Metal plates behind radiators – shiny metal reflects the heat from the radiators back into the room so it doesn’t escape through the walls Page 16 of 52 Subject Grade Date Block week Unit/Lesson Study Sheet physics 9 3 4 Unit 3-Lesson 7- Insulating House Discuss the design features of buildings which help keep them at a comfortable temperature Apply and explain examples of insulation that can be used to stop thermal energy moving Objectives: Mention and explain methods for how convection is used to keep buildings cool without air conditioning (e. wind catchers which may be used in combination with a qanat to cool the air) Mention and explain methods to decrease heating due to radiation Page 17 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 4 Unit 3-Lesson 4 -Thermal radiation Investigate practically the heat transfer by radiation using scientific skills: a. Objectives: Identifying variables b. Design a fair test c. Recording data d. Representing data in graphs Investigation for illustration only Page 18 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 4 Unit 3-Lesson 4 -Thermal radiation Investigate practically the heat transfer by radiation using scientific skills: a. Objectives: Identifying variables b. Design a fair test c. Recording data d. Representing data in graphs Page 19 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 4 Unit 3-Lesson 4 -Thermal radiation Investigate practically the heat transfer by radiation using scientific skills: a. Objectives: Identifying variables b. Design a fair test c. Recording data d. Representing data in graphs Page 20 of 52 Worksheet Page 21 of 52 Subject Grade Date Block week Unit /Lesson Worksheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Investigate using practical work the thermal expansion in solids, Objectives: liquids and gases. 1. Thermal expansion Group1 : solid Thermal expansion in solids can be understood with the ball and ring experiment. 1-Take a metal ball and a ring, the diameter of the ball should be such that it just passes through the ring. 2-Heat the ball for some time over a burner. Try to pass it through the ring. observation …………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ………………………………………………… Conclusion ……………………………………………………………………………………………………………… …………………………………………………………………………………………………………….. 2. Group 2 : liquid Take a round flask and fill it with coloured water Close the flask with a single-holed rubber stopper. Insert a capillary tube into the flask such that some water from the flask gets into the capillary tube and reaches a certain level. Heat the flask over a burner. Observe the level of water in the capillary tube. Now stop heating the flask and observe the level of water in the capillary tube. Find out how liquid response to heat observation ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Conclusion ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Page 22 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Investigate using practical work the thermal expansion in solids, liquids and Objectives: gases. 3. Group 3 : gas Take an empty test tube and close its mouth with a single-holed rubber stopper. Put a mount of coloured water is trapped in the capillary tube. Insert the capillary tube into the test tube through the single-holed rubber stopper. Hold the test tube with a test tube holder, and heat it over a burner. Observe the level of coloured water in the capillary tube. Stop heating the test tube and cool it. Find out how gas response to heat Observation ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Conclusion ……………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………….. ….. Page 23 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 1 Unit 3-Lesson 1 -Thermal expansion Explain in qualitative terms some examples for the thermal expansion in solids, liquids and gases e.g. Thermometers, fitting parts of a machine tightly together, Removing tight Objectives: lids, Bimetallic strip, joints on roads and electrical cables List examples for thermal expansion in solids liquids and gases 4. 1- 5. 2 - 6. 3 - Page 24 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 2 -Thermal conduction investigate the thermal conduction of different materials as ways by which Objectives: energy can be transferred from an object 1. Conduction in solid Use the tools in the diagram to investigate the conduction of metal rod Complete the practical sheets Tools ……………………………………………………………………………………………….. Variables: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Steps: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Results: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Conclusion ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Table of results: Page 25 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 2 -Thermal conduction investigate the thermal conduction of different materials as ways by which Objectives: energy can be transferred from an object 2. Conduction in liquid Equipment Test tube Wire gauge Bunsen burner Method 1-Take a hard glass test-tube and drop in it a tiny cube of ice, wrapped in a wire gauze. 2-Fill 3/4 of the tube with cold water and then set up the apparatus as shown in the diagram. 3- Heat the test-tube near its mouth. Complete the practical sheets Results ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… Conclusion ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… Page 26 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 2 -Thermal conduction investigate the thermal conduction of different materials as ways by which energy Objectives: can be transferred from an object 3. Complete the practical sheet Use the tools in the diagram to investigate the conduction of different materials rods Tools ……………………………………………… ……………………………………………….. Variables: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………... Steps: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Table of results Results: ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… Conclusion ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ………………………………………………………………………………………………… Page 27 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 2 -Thermal conduction investigate the thermal conduction of different materials as ways by which Objectives: energy can be transferred from an object ………… ………… 4. A student wants to compare the conduction in different metals, using the apparatus in the diagram. Write a plan to describe how to do this investigation. In your answer include: what you will keep the same what you will observe how you will know which metal is best conductor and poor conductor how you will make the experiment safe. Page 28 of 52 Subject Grade Date Block week Unit/Lesson Practical Sheet physics 9 3 2 Unit 3-Lesson 3 -Thermal convection investigate in practical context the convection in liquid as ways by which Objectives: energy can be transferred from an object 5. You can also use the special piece of apparatus shown in the diagram. It is a "square " glass tube filled with water. Drop a crystal of potassium permanganate into the top and then heat one of the bottom corners gently. Observation: ……………………………………………………………………………………… ………………………………………………………………………………………. Conclusion ……………………………………………………………………………………… ………………………………………………………………………………………. Page 29 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 3 -Thermal convection Explain convection on a particle level (including specific reference Objectives: to density) 6. Page 30 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 2 Unit 3-Lesson 3 -Thermal convection Explain convection on a particle level (including specific reference Objectives: to density). Page 31 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 3 Unit 3-Lesson 4 -Thermal radiation Investigate practically the heat transfer by radiation using scientific skills: a. Identifying Objectives: variables b. Design a fair test c. Recording data d. Representing data in graphs 1. Investigating absorption and radiation Method 2 A student wants to compare the absorption in using different colored surface, using the apparatus in the diagram. Write a plan to describe how to do this investigation. In your answer include: What you will keep the same What you will observe How you will know which surface is best absorber and poor absorber How you will make the experiment safe. Page 32 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 3 Unit 3-Lesson 5 -Evaporation Relate the evaporation to cooling effect Objectives: Differentiate between boiling and evaporation 2. 1 2 Page 33 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 3 Unit 3-Lesson 5 -Evaporation Relate the evaporation to cooling effect Objectives: Differentiate between boiling and evaporation 3. 4. 5. 5 Page 34 of 52 Subject Grade Date Block week Unit/Lesson Unit 3-Lesson 6- Application of Worksheet physics 9 3 4 conduction, convection and radiation Compare and contrast conduction, convection and radiation, at the Objectives: particle or wave level 1. 1-Radiators are used to transfer heat to their surroundings. a) Why do radiators have a large surface area? ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… b) Explain why a radiator would transfer heat quicker to a metal spoon in contact with it, than to the air surrounding it. ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… …….. 2. List four features of a vacuum flask that reduce non-useful heat transfers. State whether each reduces conduction, convection or radiation. 1- 2- 3- 4- Page 35 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 4 Unit 3-Lesson 6- Application of conduction, convection and radiation Objectives: Compare and contrast conduction, convection and radiation, at the particle or wave level 3. An Engineer makes a device that absorbs thermal energy from the Sun. The absorbed energy heats water. In the device, cold water flows slowly from an upper tank, through a white plastic pipe, to a lower tank. Energy from the Sun heats the water as it flows, as shown in Fig. 5.1. (a) The engineer measures the temperature of the water in each tank. State the name of the instrument used for measuring temperature.............................................................................................................................................. (b) (i) State the name of the process that transfers thermal energy from the Sun to the white plastic pipe.............................................................................................................................................. Page 36 of 52  Subject Grade Date Block week Unit/Lesson Worksheet Unit 3-Lesson 6- Application of physics 9 3 4 conduction, convection and radiation Compare and contrast conduction, convection and radiation, at the particle or wave Objectives: level (ii) State the name of the process that transfers thermal energy through the plastic wall of the pipe to the water inside the pipe................................................................................................................................................ (c) The engineer wants to increase the thermal energy absorbed by the water in the pipe. Suggest two improvements he can make to increase the thermal energy absorbed. In each case, explain why the suggestion increases the thermal energy absorbed. improvement 1............................................................................................................................................................................................................................................................................. explanation.................................................................................................................................................................................................................................................................................. improvement 2............................................................................................................................................................................................................................................................................. explanation.................................................................................................................................................................................................................................................................................. [Total: 7] Page 37 of 52  Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 4 Unit 3-Lesson 7- Insulating House Discuss the design features of buildings which help keep them at a comfortable temperature Apply and explain examples of insulation that can be used to stop thermal energy moving Objectives: Mention and explain methods for how convection is used to keep buildings cool without air conditioning radiation 4. The diagram shows different ways of making house more energy efficient. 1 Which of these things describes a more energy efficient house compared to a less energy efficient one? Tick two boxes.  Less energy is transferred through the walls by heating.  The house is always warm inside.  Fuel bills are lower.  It has gas central heating.  Less energy is needed to heat it if both houses are kept at the same temperature. 2- Name one feature of the house that reduces the energy transferred by the following: a radiation _____________________________________________________________________ b conduction ___________________________________________________________________ c convection ___________________________________________________________________ 5 Explain two ways the walls of a house can be built to keep the house warmer. (3 marks) …………………………………………………………………………………………………….. ……………………………………………………………………………………………..……… ………………………………………………………………………………………………..…… ………………………………………………………………………………………..…………… ……………………………………………………………………………………………………. Page 38 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. Section A 1 2 Page 39 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 3 4 5 Page 40 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 6 7 8 Page 41 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 9 10 Page 42 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 11 12 Page 43 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 13 14 Page 44 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. Section B 14 Page 45 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 5 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 15 Page 46 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 5 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 17 Page 47 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 18 Page 48 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 5 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions ( MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. 19 Section C Page 49 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 5 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions ( MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. Page 50 of 52 Subject Grade Date Block week Unit/Lesson Worksheet physics 9 3 Unit 3-Lesson 8 (Revision) Recall all their knowledge about unit 3 Apply their knowledge to answer different types of questions (MCQ, short answers and long answers Objectives: questions) Assess their progression by self-assessment for their answers. Student Name: ………………………………………………………………………………………………………………………. Class …….. Page 51 of 52