For the same amount of input work, which effect reduces the useful mechanical work a lever delivers?
Question and options
For the same amount of input work, which effect reduces the useful mechanical work a lever delivers?
Using a stationary fulcrum
Friction at the pivot
Changing the direction of the applied force
Moving the load through a shorter distance at greater force
Answer and explanation
Correct answer: B - Friction at the pivot
Efficiency compares useful output work with input work. Pivot friction converts some input work into heat, reducing the useful output. In an ideal lever, exchanging force for distance can leave the amount of work unchanged.
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