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A block of mass 4kg slides down a plane inclined at 37 degrees with the horizontal. the lenght of the plane is 3m the coefficient of friction between the

block and the plane is 0.2. Find thework done by gravity, the frictional force and th norml b/w the bloack & the plane as it moves from top to bottom



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Work done by gravity = - m g 3 sin 37  =  - 4*9.81*3*sin 37 = - 70.845 Joules

Normal force = m g cos 37 = 4 * 9.81 * cos 37 = 31.34 Newtons

Work done by friction = 0.2 * 31.34N * 3meters = 18.8 Joules

Work done by Normal force =  0 as displacement is perpendicular to the direction of force.

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