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Laws of motion: Force, friction, Pulleys.

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A clown weighs 890 N. The coefficient of static friction between the clown's feet and the ground is 0.53. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force that the clown must exert to yank his feet out from under himself?

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Solution Summary

The minimum force required by a person to pull himself using three pulleys is calculated using the forces and tension in the rope.

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Tension force
A clown weighs 890 N. The coefficient of static friction between the clown's feet and the ground is 0.53. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force that the clown must exert to yank his feet out from under himself
Answer:
At the time of the minimum pulling ...

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