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Jack Screw Friction Force

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A jack-screw has a handle 35 inches long and a pitch of 7/32 inches. If a pull of 15 lbs. is required at the end of the handle to lift a 3,000 lbs. load, what is the force expended to overcome friction?

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Solution Preview

Given:
Applied force (Fa) = 15 lbs
Handle length (R) = 35 inches
Load to be lifted (W) = 3 lbs
Pitch (p) = 7/32 inches

This problem can be solved using work and ...

Solution Summary

In this problem we estimate friction force when a jack screw is lifted up with a handle of given length. To solve this problem, a concept of law of conservation mechanical energy is applied.

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