Question

A ball on a string travels once around a circle with a circumference of 2.0 m. The tension in the string is 5.0 N. How much work is done by tension?

Short answer

Work done by the tension is zero.

Step-by-step solution

Given

A ball on a string travels once around a circle with a circumference of 2.0 m. The tension in the string is 5.0 N.

Explanation

The work done is the multiplication of the force and displacement in the same direction.

In this work and force are at 90^o angle.

This means the there is no force component in the direction of displacement.

So the work done is W = F x 0 =0.

Alternatively

We can say $W=F.d.\cos {90}^o=0$

So the work done is Zero.