| One day Tom and Sam were waiting for the train. |
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 | What are you reading about? | |
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| I am reading about pulleys. | |
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| What is a pulley? | |
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| A pulley is a wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is used to raise heavy weights. | |
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| Why do we use pulleys? | |
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| We use pulleys becuse they make your job of lifting things easier. | |
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