Homework Help: Physics

Posted by Nikita on Thursday, October 22, 2009 at 1:01pm.

An object rests on an inclined surface thanks to the presence of static friction forces between the object and the surface.
The magnitude of the friction force that prevents the object from sliding is found to be 30 N.
Now, the angle that the surface makes with respect to the horizontal is increased, and the object is found to be still at rest.
The magnitude of the friction force that prevents the object from sliding is now ...

choices:
a) zero
b) larger than zero but smaller than 30 N
c) Equal to 30 N
d) Larger than 30 N

My ans: I think it should be greter than 30N so B

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