Question

You push an 8.0-kg box 2.0 meters on a frictionless surface with a force of 35 N, increasing its speed as you push.A) How much work do you do on the box?B)How much work does normal force do on the box?

Answer 1

The word done refers to the product between the exerted force and the distance that the body was moved. In this case, we have F =35N and d = 2.0 m, so

`\begin{gathered} W=Fd \\ W=35N\cdot2m \\ W=70J \end{gathered}`

(a) The work done is 70 J.

(b) In this case, the normal force doesn't exert any work because there's no friction.