Question

One joule work is said to be done when:

• A. A force of 1 N displaces a body by 1 cm.
• B. A force of 1 N displaces a body by 1 m.
• C. A force of 1 dyne displaces a body by 1 cm.
• D. A force of 1 dyne displaces a body by 1 m.

Answer 1

The correct option is B

A force of 1 N displaces a body by 1 m.

Explanation of correct option:

1. SI unit of work is joule which is denoted by J.
2. $1joule=1newton\times 1meter$
3. $1J=1Nm$
4. 1 joule of work is said to be done when a force of 1 Newton moves an object through a distance of 1 meter in direction of force.

So, the correct option is (b).