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Question
A pendulum with bob of mass m is oscillating on either side from its resting position A between the extremes B and C at a vertical height h and above A. What is the kinetic energy K and potential energy U when the pendulum is at position?
- A,
- B and
- C
Solution
- At position A, the pendulum has maximum kinetic energy and its potential energy is zero at its resting position. Hence, K.E. = mgh and U = 0.
- At B, kinetic energy decreases and potential energy increases. Hence, K.E. = 0 and U = mgh
- At C, there is also kinetic energy K.E. = 0 and potential energy U = mgh.
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