Mechanical Advantage The pulley system shown in the figure is used to lift a 52-

Question

Mechanical Advantage The pulley system shown in the figure is used to lift a 52-kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.

A. Determine the force F

required to lift the crate with constant speed.

B. Determine the tension in the upper chain.

C. Determine the tension in the lower chain.

Mechanical Advantage The pulley system shown in the figure is used to lift a 52-kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.

Explanation / Answer

a) T = F

2T =2F = mg

F = 52g/2 = 254.8 N

b) T = 2F = 509.6 N

c) T =2F = 509.6 N

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