A pendulum bob of mass is displaced by a small angle

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

A pendulum bob of mass

m

is displaced by a small angle

\theta

. Which mathematical approximation is applied to the term

\sin\theta

so that the restoring force becomes directly proportional to the arc-length displacement

s

? State the approximation clearly.