Unit 1.P.2: Sensing Sound

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Phillip Elliott
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Classifying By the end of this unit you should know: We use our senses to detect sound.

1 Unit 1.P.2: Sensing Sound Sensing sound Experiencing sounds Science skills: Predicting Observing Classifying By the end of this unit you should know: We use our senses to detect sound. We hear things with our ears. Animals have sharper hearing than humans. Having two ears helps tell us where a sound is coming from. There are sounds that are either too high or too low for us to hear. 76

2 1.9.1, 1.9.2, Physical processes Ears Our sensory receptors We hear with our ears. Our ears also help us to detect where a sound is coming from. Children have more sensitive ears than adults. They can recognize a wide variety of sounds. Animals hear more sounds than humans. Dolphins have the best sense of hearing among animals. They are able to hear 14 times better than humans. 77

3 Activity (1): A. Say whether the following statements are true or false. 1. We hear with our ears. ( ) 2. Our ears can hear the faintest sounds.( ) 3. Animals hearing is sharper than humans.( ) 4. Dolphins can hear 14 times better than us.( ) B. Read the passage on page, and fill in the blanks. 1. Our help us to detect sounds. 2. Ears warn animals from their. 3. Dolphins have the best sense of. 4. Children have more sensitive ears than. 78

4 Activity (2): Experiment Go for a listening walk around your school compound and try listening to different sounds: Hear everything Hear some things Hear nothing Both ears One ear covered Both ears covered 79

How ears help animals? Most of animals have strong sense of hearing.

5 How ears help animals? Most of animals have strong sense of hearing. Ears help them to find prey and to help themselves in keeping safe from their enemies. Rabbits have large ears to help them hear their predators coming even before they get there. Bats use their sense of hearing to help them find food. They can use their sense of hearing to detect trees and buildings. The elephants can also use their ears to 80

6 Activity (3): Circle the correct animal 1. Ears help them to find food. 2. They have large ears to sense danger. 3. Their ears are hard to see. 81

If our ears are working well, we hear sounds all the time.

sound and clear. Clean your ears with extra care.

Do not use cotton buds, bobby pins or sharp pointed objects to

Wear hearing protection if there is a loud noise around you.

When you are using a CD/MP3 player the volume should be

7 How to protect our ears? Our ears, are one of the most important sense organs. If our ears are working well, we hear sounds all the time. Following are some healthy ways by which we can keep our hearing sound and clear. Clean your ears with extra care. Do not put anything into your ear. Do not use cotton buds, bobby pins or sharp pointed objects to clean your ears. These objects may harm your ear. Wear hearing protection if there is a loud noise around you. Use your hands If you have to! When you are using a CD/MP3 player the volume should be comfortable, and NOT loud. Always wear a helmet when you bike, ski, roller blade or in any other activity that you might hurt your head and ears. If you ears hurt after swimming, because of Experiencing Sound water getting in, use ear blocks! 82

8 Some common sources of sound Baby crying Musical instrument Emergency services Transport Thunder Loud speaker 83

9 1.9.1, Physical processes Experiencing sound: Soft and loud Sounds There are a lot of sounds around us. Some sounds are loud and some are soft. Soft sounds cannot be heard from a distance. A whisper is a soft sound. Loud sounds also warn us of danger. We can hear the siren on a fire truck from a distance because it is loud. It also warns people to move out of the way. 84

10 LOUD and SOFT Sounds Activity (1): Circle the pictures that show loud sounds. 85

11 Activity (2): Sort the sounds: quiet/ loud 86

12 Activity (3): Sing Match the word to the picture Clap Whisper Shout Laugh 87

13 Activity (4): Here are some musical instruments. How are they played? pluck shake hit blow 88

14 Key Question Name five ways in which you can look after your ears and hearing. Name two animals which use their sense of hearing to find food

Key Words: sound soft low noisy high musical quiet ear loud drum shakers Key idea We use our ears to hear. Sounds can be soft or loud. There are a lot of sound sources around us.

15 Key Words: sound soft low noisy high musical quiet ear loud drum shakers Key idea We use our ears to hear. Sounds can be soft or loud. There are a lot of sound sources around us. Project Make your own musical instrument. Cut the neck off a balloon and throw it away. Stretch the rest of the balloon over one end of a cardboard tube. Talk down the open end of the tube and gently place a finger on the balloon to feel what is happening. 90

Unit 4P.1: Sound. How sounds are made? Loudness and pitch Hearing sound Noise Traveling of sound Echo

Unit 4P.1: Sound. How sounds are made? Loudness and pitch Hearing sound Noise Traveling of sound Echo Unit 4P.1: How sounds are made? Loudness and pitch Hearing sound Noise Traveling of sound Echo Science skills: Predicting Observing and classifying UBy the end of this unit you should: Know that sound