Question

Ellen needs to move a heavy box across the floor and then place it on a shelf that is four feet above the floor. Which use of machines would most likely require the least amount of force in order to get the box on the shelf?

A. sliding the box up an inclined plane to the shelf
B. rolling the box up an inclined plane on a cart
C. sliding the box across the floor and then lifting it using a pulley
D. rolling the box across the floor in a cart and then using a pulley

Answer 1

The answer among the choices is option C. Sliding the box across the floor and lifting it using a pulley.

Answer 2

D. rolling the box across the floor in a cart and then using a pulley