Question

If $1N$ of the force displaces the body through $1m$ in the direction of force, then the work done is said to be ______.

• A. $1J$
• B. $1N-m$
• C. $1N-cm$
• D. none of the above

Answer 1

Answer: (A), (B)

The correct options are
A $1J$
B $1N-m$

Work done by any force is given by product of force and displacement of the particle and cosine of angle $\theta$ between them.

So $W=Fs\cos \theta$

where $F$ is force applied and $s$ is the displacement of the particle,

SI Unit of work done is $N-m$ and also called $Joule\left(J\right)$.

So work done in above case is $W=Fs$, here $\theta =0$

Given $F=1N,s=1m$

So $W=1Jor1N-m$.

So possible answers are A and B.