Devonryan
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Define mechanical energy. Using the example of the pendulum, explain how kinetic and potential energy relate to the mechanical energy at different positions.

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edecatur18
In a simple pendulum with no friction, mechanical energy is conserved.  Total mechanical energy is a combination of kinetic energy and gravitational potential energy.   As the pendulum swings back and forth, there is a constant exchange between kinetic energy and gravitational potential energy.

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