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9 July, 21:30

Use the concepts of kinetic energy and potential energy to describe the motion of a child on a swing. Why does the child need a push from time to time?

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  1. 10 July, 01:28
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    When the child is moving, he/she has kinetic energy. For just a brief second before they move the other way, the child is not moving, but they have gravitational potential energy.

    The child may need a push from time to time because friction with the air causes loss of energy.
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