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

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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explanation:

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