Qstnid -15- Illustrate The Law Of Conservation Of Energy By Discussing The Energy Changes Which Occur When We Draw A Pendulum Bob To One Side And Allow It To Oscillate. Why Does The Bob Eventually Come To Rest? What Happens To Its Energy Eventually? Is It A Violation Of The Law Of Conservation Of Energy? - 15: 2-work And Energy

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#15
Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
Ans : The bob eventually comes to rest due to the frictional force offered by the air and the rigid support holding the thread.

It is not a violation of the law of conservation of energy since mechanical energy can get converted into another form of energy which cannot be utilised for useful work. This loss of energy is called dissipation of energy.