Work done by a constant force


What is the minimum amount of work in Joules that a 60 kg man must do in order to climb up a tree house that is 3 meters high?

Details and assumptions

  • The acceleration of gravity is 9.8 m/s2.-9.8\text{ m/s}^2.

A man who is standing on a ladder vertically lifts a book of mass 3 kg3\text{ kg} with a rope at a constant speed. If the change in the book's height is 7 m,7\text{ m}, how much work did the man do on the book?

The gravitational acceleration is 10 m/s2.10\text{ m/s}^2.

A weight lifter is bench-pressing a barbell whose weight is 650 N.650\text{ N}. He raises the barbell vertically by 0.60 m0.60\text{ m} above his chest with a constant velocity. How much work did the weight lifter do on the barbell?

A box with mass 100 kg100\text{ kg} is on the flatbed of a truck which is moving with an acceleration of a=1.5m/s2a=1.5\text{m/s}^2 along the positive xx-axis. The box does not slip with respect to the truck. If the displacement of the truck is s=35 m,s=35\text{ m}, what is the total work done on the box by all of the forces acting on it?

A man is pulling a sled on an icy road. The total mass of the sled is 50.0 kg,50.0\text{ kg}, and the man exerts a force of magnitude 1.20×102 N1.20 \times 10^2\text{ N} on the sled by pulling on a rope. At a distance of 13.5 m13.5\text{ m} from the starting point, the man releases the rope, and the sled stops at a distance of 18.2 m18.2\text{ m} from the starting point. If the friction force between the ice and the sled is 45.0 N,45.0\text{ N}, how much work did the friction force do on the sled?


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