Question

 You are trying to move a 500-N crate across a level floor. To start the crate moving, you 

   have to pull with a 230-N horizontal force. Once the crate “breaks loose” and starts to move, you 

   can keep it moving at constant velocity with only 200 N.

Draw a free-body diagram for crate moving at constant speed.

   d. What forces are acting on the crate moving at constant speed?

Answer 1

There are four forces that act on the crate moving at constant speed: horizontal force ($F_h$), force of friction ($F_{fr}$), normal force ($N$) and the force of gravity ($W$).