Physics Help Forum Slope and friction Friction

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Oct 11th 2009, 09:22 PM #1 Junior Member   Join Date: Sep 2009 Posts: 6 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. Attached Thumbnails
 Oct 12th 2009, 04:05 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 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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