Why is the work done zero when the force acting on a body is perpendicular to its displacement?

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Solution

We know that work done by a body in circular motion is always zero. This is because the angle between force and displacement is 90 degrees.

Now, to set 90 degrees angle between force and displacement throughout the circular motion, when force changes its direction, displacement too needs to change its direction which is actually tangential. Thus, force and displacement both change direction in order to set same 90 degrees angle between them.

Work Done = F × d × Cos (theta)

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Similar questions

Q. What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it? explain your answer.

A non-zero force is acting on a body but work done is zero. Which of the following statements justify the above situation?

1.Displacement is zero.
2.Force is perpendicular to the direction of displacement.
3.Force is parallel to displacement.
4.Force is opposite to the direction of displacement.

Question:

A non-zero force is acting on a body but work done is zero. Which of the following statements justify the above situation?

1. Displacement is zero.
2. Force is perpendicular to the direction of displacement.
3. Force is parallel to displacement.
4. Force is opposite to the direction of displacement.

is option (a) true also?

When a force acting on a body displaces it in the direction of force, the work done by the force is

Give an example work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.

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