Primary 3 General Studies Worksheets (2024-2025) - Yuen Yuen Primary School - PDF

# Po Leung Kuk Hong Kong Taoist Association Yuen Yuen Primary School ## General Studies Worksheets (2024-2025) ### Primary 3 ## Unit 2 - The Wonder of Heat and Sound ### **Worksheet 2.1** #### Objectives: Students are able to know how sounds are produced. **Reading Corner** * **How Sounds Are P...

# Po Leung Kuk Hong Kong Taoist Association Yuen Yuen Primary School ## General Studies Worksheets (2024-2025) ### Primary 3 ## Unit 2 - The Wonder of Heat and Sound ### **Worksheet 2.1** #### Objectives: Students are able to know how sounds are produced. **Reading Corner** * **How Sounds Are Produced** * Sound is made when something vibrates. * Four ways to make sounds: * Plucking * Stroking * Blowing * Striking * Sound waves cause molecules in the air to move. * This causes the eardrum to vibrate. Then you hear sounds. **Fill in the blanks or circle the correct answer with information from the picture above.** 1. There is sound when something ___vibrates___. 2. A horn makes a sound when someone (strokes / blows / plucks) it. 3. ___Vibrations___ cause molecules in the air to vibrate. 4. Name the four ways most sounds are made: * 1) Plucking * 2) Stroking * 3) Blowing * 4) Striking ### **Worksheet 2.2** #### Objectives: Students are able to know we hear with our ears and brain. **Reading Corner** * **How People Hear** * Sound waves are sent through our ears. * Three tiny bones vibrate. * Eardrum vibrates. * Outer ear * Middle ear * Inner ear * Nerve sends messages to brain **Fill in the blanks with the words from the list below.** * Brain * Sounds * Inner * Nerves * Ears * Balance * Senses * Outer * Middle * Vibrate 1. Our sense of hearing enables us to hear ___sounds___. 2. Our ___ears___ enable us to hear. 3. Our ears also help us keep our ___balance___. 4. Our ___brain___ helps us understand the message we hear. 5. ___Nerves___ send messages to our brain. 6. Our ears include the ___outer___ ear, ___middle___ ear, and ___inner___ ear. ### **Worksheet 2.3** #### Objectives: Students are able to understand how sound travels and how our ears help us locate where the sounds come from. **Reading Corner** * **How Sounds Travel** * Sound travels in waves. These waves move out in all directions. * Sound waves spread out in all directions. * Sound waves push against molecules. Sound waves travel faster when molecules are close together. * Solid - molecules are close together and sound waves travel very fast. * Liquid - molecules are close together and sound waves travel fast. * Gas - molecules are far apart and sound waves travel slowly. * **The human sense of hearing is remarkable.** * Ears can differentiate between very similar sounds, such as two different cries a child makes or two different meows from a cat. * Our ears keep us constantly informed. They tell us the direction of a sound's source. * Two ears are better than one when locating where a sound comes from. **Fill in the blanks or circle the correct answer.** 1. As sound waves move outward, the sound gets (louder / softer / doesn’t change). 2. Sound waves travel faster when molecules are ___closer___ together. 3. In which will sound waves travel faster? (milk / wood / oxygen) 4. In which will sound waves travel slower? (juice / iron / steam) 5. Sound waves make molecules move. (T/F) 6. The direction of a sound's source is easier to find with one ear. (T/F) ### **Worksheet 2.4** #### Objectives: Students are able to learn how to protect their ears. **Reading Corner** * When someone has difficulty hearing, we say that he or she is hearing disabled, hearing impaired or deaf. * There are many causes for hearing problems: * Some babies are born deaf, and many people lose their hearing as they age. * Some people don't protect their ears and then damage their ears which causes temporary or permanent damage. * Always cover your ears if you hear loud noises. * Wash your ears with clean water frequently and dry them well. * If you have an earache, go to a doctor and get it checked out as soon as possible. **A. Fill in the blanks using information from the passage above.** 1. People are ___hearing impaired___ when they have difficulty hearing. 2. Write 2 reasons why people have hearing problems: * Some babies are born deaf. * Some people do not protect their ears and damage them from loud noises. **B. Case study. Think about ways to protect your ears.** 1. If you’re standing next to a construction site that is making very loud noises, how can you protect your ears? * You should use ear protectors or cover your ears. 2. If you have an earache or your hearing seems to be blocked, what should you do? * Go to a doctor. ### **Worksheet 2.5** #### Objectives: Students are able to learn healthy ear care. **Put a tick next to the matching description box and give an example of healthy ear care and how you can hurt your ears.** * 6 images of cartoon people. First image shows a healthy ear with a checkmark on the healthy ear. * 2nd shows a healthy ear with a checkmark. * 3rd shows a healthy ear with a checkmark. * 4th shows a healthy ear with a checkmark. * 5th shows a healthy ear with a checkmark. * 6th shows a healthy ear with a checkmark. 1. Give an example of healthy ear care: * Wash your ears regularly with clean water. 2. Give an example of how you can hurt your ear: * Put sharp things in your ear. ### **Worksheet 2.6** #### Objectives: Students will know the unit for measuring volume is decibels (dB). **Reading Corner** * The unit for measuring volume is decibels (dB). Loud sounds can damage our ears and even cause deafness. We can protect our ears by using ear protectors in noisy environments. **Noise Thermometer** * 140 decibels - Immediate danger to hearing (Gunshot, Jet engine at take-off) * 125 decibels - Pain threshold (Air raid siren, Firecracker) * 120 decibels - Risk of hearing damage in 7.5 minutes (Rock concert, Sandblasting) * 115 decibels - Risk of hearing damage in 15 minutes (Baby's cry, Stadium football game) * 110 decibels - Risk of hearing damage in 30 minutes (Snowmobile from driver's seat) * 105 decibels - Risk of hearing damage in 1 hour (Jackhammer, Helicopter) * 100 decibels - Risk of hearing damage in 2 hours (Chainsaw, Stereo headphones) * 95 decibels - Risk of hearing damage in 4 hours (Motorcycle, Power Saw) * 90 decibels - Risk of hearing damage in 8 hours (Lawn mower, Truck traffic) * 85 decibels - Beginning of OSHA regulations * 30 decibels - Faint sound (Whisper) **A. Fill in the blanks.** * The unit for measuring sound volume is ___decibels___. * Loud sounds can cause ___damage___. * According to the "Noise thermometer", 140 dB of noises can ___damage___ our hearing. * To protect our hearing, we should not stay in a noisy environment for a ___long___ time. * If we work in a noisy environment, like construction sites or airports, we need to wear ___ear protectors___ to protect our ears. **B. Discussion.** "Loud sounds can damage our ears." How can we protect our hearing at school? Give one suggestion. * You should use ear protectors in a noisy environment. ### **Worksheet 2.7** #### Objectives: Students will know how sounds are used in our daily life. **Reading Corner** * **Uses of sound:** 1. **Communication with each other:** * The telephone is just one kind of telecommunication we use now. * Many types of electronic equipment change sound to electricity. * They help us send messages and information all around the world. 2. **Make music:** * Different musical instruments create sounds through different methods. * For example, percussion instruments make sound when the material stretch across the surface or the instrument vibrates. * Wind instruments make sound when the column of air vibrates. * String instruments make sound when one or more strings vibrate. 3. **Sonar:** * Sonar stands for Sound Navigation Ranging. * Marine mammals and bats use sonar for locating objects and finding food. * Humans have designed machines that let us use sonar for similar purposes. * For example, submarines use sonar to locate other large objects and to measure its distance to the ocean floor. 4. **Ultra-sonic sound:** * Ultra-sound is just what it sounds like, an ultra high-frequency sound. * The best example of ultra-sound in daily life is the ultra-sound used for seeing an unborn child in a mother's tummy. **How do we use sounds in our daily lives? Please fill in the letters in the provided boxes.** * 4 images and 4 letter options. * Image 1 - A person on a phone * Image 2 - A person playing the piano * Image 3 - A person using a toothbrush * Image 4 - An image of a fetal sonogram * A. For communicating * B. Making music * C. Sonar * D. Ultra-sonic sound * _A_ * _B_ * _B_ * _D_