A beavy box of 750 N is to be loaded onto a truck using a ramp. If the mechanical advantage of the ramp is 3, find the effort needed to move the box. step by step
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A 75 kg box has to be lifted 1.5 m onto the back of a lorry, either straight up or by using a 5 m long ramp.
(a) straight lift
work done = 75x10x1.5 = 1125 J
(b) using a 5m ramp
work done = 1125 = 5 x effort
Therefore the effort needed this time = 1125/5 = 225N
So the effort needed in a straight lift is 750 N but only 225 N if we use the ramp.
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