Question

In angle in between the direction of applied force and displacement, for maximum work should be:

• A. ${90}^0$
• B. ${45}^0$
• C. $zero$
• D. ${30}^0$

Answer 1

The correct option is C

$zero$

1. $Workdone\left(W\right)=F\times s\cos \left(\theta \right)$, where $\theta$ is the angle between Force(F) and displacement(s).
2. Hence work done will be maximum when $\cos \left(\theta \right)$ is maximum, which is at$\theta =0and\cos \left(\theta \right)=1$.
3. Hence work done is maximum when $\theta$ is at zero degrees.

Hence, option C is correct.