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# Pulley- Force and Acceleration

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A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-40. The mass of the person plus the bucket is 68 kg.

Figure 4-40.
(a) How hard must she pull downward to raise herself slowly at constant speed? (N)

(b) If she increases this force by 10 percent, what will her acceleration be (upward)?

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##### Solution Summary

The solution calculates the force required by the washer to raise herself slowly at constant speed and the acceleration if this force is increased.

##### Solution Preview

(a) How hard must she pull downward to raise herself slowly at constant speed? (N)

constant velocity means upward forces equal downward forces
Total force acting down = m*g (total weight)
Total forces acting up=
F {the tension in the rope pulling on the bucket} + F ...

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