wall BLOCK y ) 45° 15.L F In the figure above, force F pushes a block against a wall at the angle shown. The block has weight 10 N. The coefficient of static friction between the block and wall is 0.6. The coefficient of kinetic friction between the block and wall is 0.3. (a) When the magnitude of the force F is 10 N, the block remains stationary. Draw the free body diagram for the block and calculate the x- and y-component of each force acting on the block. (b) When the magnitude of the force F is 5 N, the block slides down the wall. Draw the free body diagram for the block and calculate the x- and y-component of each force acting on the block.

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”