Question

Mention the conditions where no work is done.​

Answer 1

Answer:

When the force applied on an object or the displacement of an object is zero then there is no work done on the object. When the displacement is in a direction perpendicular to the direction of the applied force, then also work done is zero.

Explanation:

Work is said to be done if a displacement is made on an object by applying a force on it. The mathematical expression of work is:

W = F ds cosθ

Where W is the work done, F is the force applied, ds is the displacement, and θ is the angle made between the force vector and displacement vector.

If any of these three quantities become zero then work is zero.

If the angle θ is 90°, then cosθ = cos90° = 0 ⇒ W = 0