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Old Nov 23rd 2011, 03:53 AM   #1
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Inclined Plane


I need help in solving the following inclined plane problem.

A block of mass 2Kg is released from rest on an frictionless inclined plane 30 degrees to the horizontal. If length of inclined plane is 12m, find the workdone by gravity and normal force when block reaches ground.

Thanks and regards,
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Old Mar 26th 2012, 11:07 AM   #2
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Work done by gravity is simply mgh, where h = vertical distance traveled. So W = mg(12 m x sin(30 deg)).

The normal force is the component of te block's weight perpendicular to the ramp:

N = mg cos(30 deg)
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