A tractor is dragging a large box across the ground with constant speed as shown. Which free-body diagram shows the normal force N, weight force W, tension force T, and kinetic friction force fk on the box?

What is the scientific definition of energy that relates to work

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

How does an observation about an object differ from an inference about that object