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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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How do you know that similar poles of a magnet repel each other

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What is a magnet.

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What are non-magnetic material? Give example

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What are magnetic material? Give examples

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What is magnetic field.

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What is magnetic compass

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How magnets can damagnetized.

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What are electromagnets

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