Keshav has a lever to lift heavy rocks. What should he do to reduce the force required to lift the rocks?

Increase the length of effort arm

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Decrease the length of effort arm

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Increase the length of load arm

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Decrease the length of the load arm

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Solution

The correct options are
A
Increase the length of effort arm

D
Decrease the length of the load arm

When the effort arm is greater than the load arm, the lever acts as a force multiplier. The amount of force required to lift an object will decrease if the length of the effort arm increases or the length of the load arm decreases. Therefore Keshav should either increase the length of effort arm or decrease the length of load arm.

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