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21 April, 14:41

As a pendulum swings, the amounts of potential and kinetic energy change. Does the amount of mechanical energy change?

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  1. 21 April, 18:18
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    No, the mechanical energy does not change if it is ideal.

    We define mechanical energy as the sum of kinetic energy and potential energy

    ME = PE + KE

    When the pendulum swings, potential energy is converted to kinetic energy and vise versa. But the sum of both remains constant, which is the mechanical energy.
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