ASVAB Practice Test

How does increasing the length of the effort arm in a lever affect the effort needed to lift a load?

1. Increases the effort needed

2. Decreases the effort needed

3. Has no effect on the effort needed

4. Makes the effort arm heavier

The correct answer is: Decreases the effort needed

Increasing the length of the effort arm in a lever effectively increases the lever's "speed" or mechanical advantage, decreasing the amount of effort needed to lift a load. Option A is incorrect because increasing the effort arm length does the opposite. Option C is incorrect because it does have an effect on the effort needed. Option D is incorrect because it does not accurately describe the effect of increasing the effort arm length on the effort needed.