What is the expression for the tangential restoring force acting on a simple pendulum…

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

What is the expression for the tangential restoring force acting on a simple pendulum bob of mass mm when it is displaced by a small arc length ss from its equilibrium position? (a) Ft=−mgLsF_t = -\dfrac{mgL}{s} (b) Ft=−mgLsF_t = -\dfrac{mg}{L}s (c) Ft=−12 mgLsF_t = -\dfrac{1}{2}\,\dfrac{mg}{L}s (d) Ft=−mgsin⁡ ⁣(sL)F_t = -mg\sin\!\left(\dfrac{s}{L}\right)

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