Question

A worker pushing a 35.0-kg wooden crate at a constant speed for 13.2 m along a wood floor does 360 J of work by applying a constant horizontal force of magnitude F0 on the crate.

 (a) Determine the value of F0. 

 (b) If the worker now applies a force greater than for describe the subsequent motion of the crate. This answer has not been graded yet.

 (c) Describe what would happen to the crate if the applied force is less than Fo This answer has not been graded yet.

Answer 1

When forker is applying force F₀ than block is moving with constant speed. It means friction force and applied force are equal in magnitude at surface.

(a) work done by force W = F₀.d

Than F₀ = 360/13.2

  F₀ = 27.27 N

(b) when force will increase than there will net non zero force in horizenta direction. So block will accelerate now.

(c) if force is decreased than applied force will become less than friction force than block will not move on surface.