The diagram below shows a pendulum which was released from position A. (a) What form(s) of energy did the pendulum have at (i) A? (ii) B? (iii) C? (b) Eventually the pendulum would stop moving. Explain what has happened to the initial energy of the pendulum.

Question

The diagram below shows a pendulum which was released from position A. (a) What form(s) of energy did the pendulum have at (i) A? (ii) B? (iii) C? (b) Eventually the pendulum would stop moving. Explain what has happened to the initial energy of the pendulum.

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Answer

(a) (i) Potential energy

(ii) Potential energy + Kinetic energy

(iii) Kinetic energy

(b) The initial energy is transformed into heat energy when the pendulum bob strikes the air molecules. Thus, the amplitude of pendulum decreases and finally it stops.

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