The wheels, axle, and handles of a wheelbarrow weigh W = 59 N. The load chamber

Question

The wheels, axle, and handles of a wheelbarrow weigh W = 59 N. The load chamber and its contents weigh WL = 619 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.

Explanation / Answer

choosing pivot through axle of the wheel: (a) W*0.6+WL*0.4=F*1.3 =>F= 217.69 N (b)W*0.6+WL*0=F*1.1 =>F=32.18 N

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