First slide

Concept of potential energy

Question

A simple pendulum has a length 1m. The mass of bob is 100g. If it is displaced through $60^{\circ}$ from equilibrium, the potential energy of bob in this position is

Moderate

A

0.25J
B

0.5J
C

0.75J
D

1J

Solution

$\begin{array}{l} U = m g h = m g l (1 - \cos θ) \\ U = 0.1 \times 10 \times 1 [1 - \frac{1}{2}] = 0.5 J \end{array}$

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