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Old Oct 11th 2009, 09:22 PM   #1
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Slope and friction Friction

I am unable to solve this question

A small block of mass m rests on a rough, sloping slide of a triangular block of mass M which itselfs rests on a horizontal frictionless table(as shown in attached pic) IF the coefficient if static friction is U, determine the minimum horizontal force F applied to M that will cause the small block m to start moving up the incline.
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Slope and friction Friction-phyiscs.jpg  
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Old Oct 12th 2009, 04:05 AM   #2
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Resolve the weight and force into their components and add .

When the force of friction balances the net force down the incline, this is the threshold. A larger force will push the block up the incline.

Thus, U(mg cos theta - F sin theta) = mg sin theta + F cos theta
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