Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.

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Solution

In a simple pendulum, the bob contains all of its mass.
The bob is suspended from rigid support, which is massless.
In position A, it has max. Potential Energy. and zero Kinetic Energy.
In position B, it has zero Potential Energy. and max. Kinetic Energy.
In position C, it has max. Potential Energy. and zero Kinetic Energy.

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