Question

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

o​

Answer 1

Ans. In the case of pendulum energy in the Bob at any instant of time, can be either potential

energy (P.E) or kinetic energy (K.E) or a mixture of both but its total energy at any instant of

time remains constant. This can be illustrated by below illustration in the figure.

In case of pendulum energy in the Bob at any instant of time

when the pendulum Bob is at position B.It has only potential energy(P.E) and no kinetic

energy(K.E)

As the Bob starts moving from position B to position A potential energy(P.E) decreases but

Kinetic Energy(K.E) increases

when the Bob reaches position A, there is only kinetic energy(K.e) but no potential

energy(P.E)

As Bob moves from position A to position C, potential energy(p.E) increases but kinetic

energy decreases.

when Bob reaches position C, Bob stops for a very small instant of time, At that time, Bob

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