Practice Questions Robert Mele

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Mechanical Efficiency Robert Mele
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Practice Questions

It takes 600J of energy to lift a box 2.5m. Determine which of the following systems would give the greatest mechanical efficiency to perform this task and should be used.




a. The effort arm of a lever is pushed through 4m with a force of 150N.



b. The box is pushed up an 8m long ramp with a force of 120N.



c. A force of 150N is exerted on the rope of a pulley, which is attached to the box and the rope moves 6.5m.