Key Terms

average power

work done in a time interval divided by the time interval

kinetic energy

energy of motion, one-half an object’s mass times the square of its speed

net work

work done by all the forces acting on an object

power

(or instantaneous power) rate of doing work

work

done when a force acts on something that undergoes a displacement from one position to another

work-energy theorem

net work done on a particle is equal to the change in its kinetic energy