How Do You Calculate the Force Needed to Turn a Handle in a Pulley System?

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To calculate the force needed to turn a handle in a pulley system, perform a moment balance calculation around the center of the handle to find the force required to keep it stationary (F_0). The force applied to move the mass must exceed F_0. Lifting the mass requires a specific force measured in Newtons, while turning the handle involves torque measured in Newton-meters. The relationship between these forces is crucial for understanding the mechanics of the system. Proper calculations ensure effective operation of the pulley system.
MischaHam
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i have a simple pulley with a mass a one side and turning handle at the other. i can calculate the tension in the pulley but i am not sure how to calculate the force required to turn the handle and move the mass, or is this simply just equal to the tension in the system?
 
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Assuming your turning handle looks like this:
http://www.midcurrent.com/news/images/Cranky%20winding%20high%20res.jpg

To calculate the force required to keep the handle in place (F_0), do a moment balance calculation about the center of the turning handle. (summation of moments = zero). To move the mass, the force applied will thus have to be greater than F_0.
 
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You need force (Newtons) to lift the mass. You need torque (Newton-meters) to turn the handle.

Bob S
 

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