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What is sound? How is it travel.
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How noise and musical notes are produced.
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Define hertz.
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How bats uses echoes to find the way.
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What is an echo? How it is produced.
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What is a medium.
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.Define frequency.
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What is the sound range of human ears
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How low and high sounds are produced.
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What are sound waves.
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Who was Sir Isaac Newton. How did he discover gravity
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How streamlining can help to reduce friction
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What is the importance of gravity
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How lubrication can reduce friction.
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Give an example of friction
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Define force.
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Define mass. Give unit.
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Define gravity
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What are disadvantages of friction.
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Define friction.
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