The wheels, axle, and handles of a wheelbarrow weigh W = 62 N. The load chamber
ID: 1784653 • Letter: T
Question
The wheels, axle, and handles of a wheelbarrow weigh W = 62 N. The load chamber and its contents weigh WL = 670 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the handles that is directed vertically upward. Consider a rotational axis at the point where the tire contacts the ground, directed perpendicular to the plane of the paper. Find the magnitude of the man’s force for both designs.
W o.do m'o.700 m b.600 mo.700 m 0.200mExplanation / Answer
Design 1: F = (1/1.3m)(670N*0.4m + 62N*0.6m) = 234.8 N
Design 2: F = (1/1.3m)(62N*0.6m) = 28.6 N
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