Question

1. which would be the easiest way to move a heavy box up 4 feet?

to lift it up.
to slide it up a 4 foot ramp.
to slide it up a 2 foot ramp.
to slide it up a 8 foot ramp.

Explanation:

A ramp is a simple machine. The longer the ramp, the less force is needed to move the object up. Since we want the easiest (requiring least force) way, a longer ramp is better. Lifting directly requires force equal to the weight of the box. Among the ramp options, an 8 - foot ramp is the longest.

Answer:

To slide it up an 8 foot ramp.