Efficiency? 5. Challenge yourself: An ideal system with one fixed and one moveable pulley has a
mechanical advantage of two. Suppose a real system with one fixed and one moveable
pulley had an efficiency of 80%. (Recall that a standard pulley has a weight of 5 newtons.)
A. Using this system, how much force will be needed to lift a 45-N load?
B. Check your answer using the Gizmo. How much force was needed?
C. Modify your efficiency equation from #4 above to factor in mechanical advantage.
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Text Predictions: On
EUS
100
o
RI
9