Question: A block of weight W is pulled up a plane forming an angle with the horizontal by a force P directed along the plane.

A block of weight W is pulled up a plane forming an angle α with the horizontal by a force P directed along the plane. If μ is the coefficient of friction between the block and the plane, derive an expression for the mechanical efficiency of the system. Show that the mechanical efficiency cannot exceed 1/2 if the block is to remain in place when the force P is removed.

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y Wcosa 1 x Ja WSIND X Efficiency EF 0 EF 0 Equation 2 17 Equation 1 Input work P 8x Output work ... View full answer

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