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Grade: 11

                        

A swinging pendulum eventually comes to rest. Is this a violation of the law of conservation of mechanical energy?

5 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							No, this is not a violation of the law of conservation of mechanical energy.
When the pendulum swings in air, it does work against the friction of the air to sustain swinging. In the process, some of the other energy is dissipated and converted into thermal energy. This makes the pendulum to lose some of its mechanical energy. As it starts losing energy, it will come to rest when all its mechanical energy is dissipated. This is not the violation of the law of conservation of mechanical energy because there is transfer of energy from one form to other. The transformation is from mechanical energy into thermal energy.
5 years ago
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