Lecture8

# Lecture8 - Example 3 Washer See demo in class A washer...

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Example 3 Washer - See demo in class A washer pulls himself upward using the pucket-pulley. How hard he needs to pull to raise himself at constant speed? How hard an outside person should pull him up to raise him at constant speed?

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Example 3 Washer - See demo in class Let’s now use a mechanical advantage with 6 pulley. What force does the washer need to apply in this case? And what about the external force needed?
Example Two blocks of mass m 1 and m 2 are in contact. A force F is applied to m 1 . Assume m 2 can slide on a frictionless surface, while m 1 can slide on the side of m 2 and it experiences a finite friction. See figure below. Let’s assume m 1 =m 2 . Find the possible range of value for F to allow m 2 to move but m 1 not to slide down. frictionless m 1 m 2

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Example Two blocks of mass m 1 and m 2 are connected by a cord and can slide down on an incline of angle θ . The coefficients of friction are μ 1 and μ 2 .

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