Discussion on: Problem 536 | Friction on Wedges

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Benjamin_Molina
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!

Benjamin_Molina

How do you know where to exactly put or locate R (reaction)? Is there a rule?

Jhun Vert
Jhun Vert's picture

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.

Benjamin_Molina

Thank you so much Engr. Verterra. That was a big help.

John Luigi
John Luigi's picture

why is it that B has friction force when it is stated in the problem that B is at rest?

Jhun Vert
Jhun Vert's picture

why is it that the floor has friction force when it is at rest?

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