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Question
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.
Solution
The diagram shows a freely oscillating pendulum.
In position A, it has max. P.E. and zero K.E.
In position B, it has zero P.E. and max. K.E.
In position C, it has a max. P.E. and zero K. E.
Thus, the experiment clearly proves that the sum of the total energy is conserved, but it can change its form.
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