Discussion on: Problem 536 | Friction on Wedges

Following is a discussion on the Reviewer item titled: Problem 536 | Friction on Wedges. Feel free to add your own comments!

In reply to by Benjamin_Molina

R is the resultant of normal reaction N and the friction force f. The direction of R depends on the the direction of friction. Friction is the component of R parallel to the plane of contact.

The figure below below shows R for friction directed down the plane of contact.
 

mech_problem_536_friction_down.gif

 

If the friction force is directed up the plane, then R would be as shown below.
 

mech_problem_536_friction_up.gif

 

I hope that cleared you up.