Question

Work done by a force is described by the equation $W=F\times s\cos \theta$.For which value of $\theta$ is the work done is maximum.

Answer 1

1. A work is said to be done if we applied a force on an object and the object moves to a distance.
2. So work done,

$W=F\times s\cos \theta$

Where F is the applied force and s is the displacement in the direction of the force.

1. If, $\theta$=$0^0,\cos \theta =0andW=Fs$
2. If, $\theta$=$90$,$\cos 90=0andW=0$
3. if, $\theta ={180}^0,\cos 180=-1andW=-Fs$

Hence, work done is maximum when $\theta =0^0$.