A lever is used to lift a rock. How does the lever help lift the rock?
A) The lever makes it easier to lift the rock with less effort.

B) The longer the lever, the easier it is to lift the rock.

C) The lever makes the rock heavier.

D) The lever makes the rock smaller.

Answer: B. A and B

A explains the PURPOSE: The whole reason we use a lever is to make a job "easier" by reducing the effort (the force you have to push with).
B explains the METHOD: A longer lever (specifically a longer effort arm) is the physical change that actually creates that "easiness". By increasing the length, you gain more mechanical advantage, which is what lets you lift a heavy rock with much less strength

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