Question

Work is said to be done if the force and displacement are

• A. Parallel to each other
• B. Opposite to each other
• C. Inclined at an angle with each other $\theta (\ne {90}^{\circ })$
• D. All of the above

Answer 1

The correct option is D All of the above

Since work done is given by $W=Fscos\theta$

1. So for parallel case $\theta =0^o$ and $W=Fs$

2. For opposite case $\theta ={180}^o$ and $W=-Fs$

3. For any angle $\theta ,W=Fscos\theta \ne 0$

So in all above cases, we can say that work has been done.

Hence option (d)