how do vibrations of simple pendulum and motion of a ball over a watch glass illustrate the principle of energy conservation

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Dear student
in case of vibrations of simple pendulum kinetic energy of bob gets converted into potential energy and again potential energy convert back into kinetic energy . so conversion of energy takes place and we get vibrations in simple pendulam
in case of of watches of old time the elastic potential energy of springs get converted into the KE of motion of stick of watchs .

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