Will you hire Mr. Fric ?
Classical Mechanics
Level
2
Work done by Friction is
(A) Always Positive
(B) Either Zero or Negative
(C) Either Negative or Zero or Positive
(D) None of these
(A)
(D)
(C)
(B)
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
Work done by friction may be zero, positive, or negative depending upon the situation.
When force applied on a body is insufficient to overcome the friction, work done by the friction force is zero.
When this force is large enough to overcome the friction then, work done by the friction force is negative.
When force is applied on a body that is placed above another body, the work done by the friction force on the lower body is positive (when the system moves in the direction of applied force)