A block is launched up a frictionless ramp, as shown, with initial speed vt. The

Question

A block is launched up a frictionless ramp, as shown, with initial speed vt. The block travels up the ramp and continues across the level section. List the forces exerted on the block after it has been launched, as it moves up the ramp. Which forces, if any. do non-zero work on the block? Which forces, if any. do zero work on the block? Write an expression for the net work done on the block from the bottom to the top of the ramp. Express your answer in terms of one or more of the following quantities: the weight mg of the block, the angle theta, and the height H of the ramp. Show your work.

Explanation / Answer

a) forces exerted are gravity & normal force

gravity has non zero work on block

normal has zero work on block

b)net work done = work done by gravity = force * displacement = mgsin0 * Hcosec 0 = mgH

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