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Question

A coolie uses a sloping wooden plank of length 2.0m to push up a drum of mass 100kg into the truck at a height 1.0m.
(a) What is the mechanical advantage of the sloping plank ?
(b) How much effort is needed to push the drum up into the truck ?
What assumption have you made in arriving at the answer in part (b) above ?

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Solution

Length of sloping wooden plank l=2.0m
Load =100kgf
Height of inclined plane h=1m
(a) The mechanical advantage of the sloping plank
M.A.=lh=21=2
(b) Effort needed to push the drum up into the truck =
Effort=LoadM.A.=1002=50kgf
Assumption: There is no friction between the drum and the plank.

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