Question

Write true or false for the following statements: 

In order to get minimum work, the angle between force and displacement should be 90.

Answer 1

True 

Explanation: When force is applied at an angle to the direction of motion of object then the work in the direction of motion is given by: 

W = Fs cos θ 

If angle θ between force and displacement is 90 then cos θ will be equal to zero. 

So, work done will also be zero by the given formula which means minimum.