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March 30, 2015

Homework Help: Physics

Posted by Nikita on Thursday, October 22, 2009 at 3:15pm.

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 ...

a) zero
b) larger than zero less than 30N
c) exactly equal to 30N
d) greater than 30N

I think it is greater than 30N

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