Question

what is the work done by the force of tension in the string of simple pendulum

Answer 1

The work done by tension on the string of a simple pendulum is always zero.

This is because the direction of tension is such that it always acts perpendicular to the displacement produced. So, as θ = 90o, Cosθ = 0 and so is the work done (work done being W = FsCosθ)

Answer 2

The work done by force of tension in the string of simple pendulum is always zero

Work done = Force x displacement x cosФ

Here, Ф = 90° , as the force applied is perpendicular

As,cos90° = 0
So the work done is zero

Hope This Helps you! :)