9. Work & Energy

Which of the following sets of information would a student need to calculate the net work done on an object according to the work-energy theorem?

A crate of mass $m$ is pulled across a horizontal floor by a constant force $F$ at an angle $\theta$ above the horizontal. The coefficient of kinetic friction between the crate and the floor is $\mu$. What is the net force acting on the crate in the horizontal direction?

In the context of the work-energy theorem, which of the following best describes the net force acting on an object?

You pull a 3kg box on a flat surface. The coefficient of kinetic friction is 0.6. When you pull the box horizontally through a distance of 10m, it accelerates at 2m/s². Find the net work on the box.

To pull a 51 kg crate across a rough floor, a worker applies a force of 100 N, directed 37°above the horizontal. The coefficient of friction is 0.16. If the crate moves 3.0 m, what is the total work done on the crate?

A box slides across the floor with an initial speed of 3.5m/s. If the coefficient of kinetic friction is 0.15, how far will the box slide before stopping completely?