Question

1. Two friends want to place a heavy box (20 kg) that is sitting on the ground into the back of a moving truck, which is 1.2 m above the ground. They have three different approaches; for each of these possibilities, calculate the amount of work they will have to do, as well as the change in the gravitational potential energy of the box: (a) place the box on a dolly and roll it up a ramp into the back of the truck (assuming negligible rolling friction); (b) pick the box up and place it directly into the back of the truck; (c) pick the box up, walk around the truck with it one time, and place it into the back of the truck. (d) One friend decides that rather than using the dolly, she will push the box up the ramp instead. If there is friction present, will she have to do more or less work than the other methods? Will the change in gravitational potential energy of the box be different?

Answer 1

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