__Potential energy__- energy that is stored in by an object.

2.

__Gravitational potential energy__- achieved by doing work against the force of gravity.

3.

__Work__- the transfer of mechanical energy.

4.

__Kinetic energy__- the energy of motion.

5.

__Mechanical energy__- combination of kinetic and potential energy.

6.

__Work-Kinetic energy theorem__- the special relationship between doing work on an object and the resulting kinetic energy of the object.

7.

__Negative work__- removes energy from an object.

8.

__Positive work__- adds energy to an object.

9.

__Conservative force__- when a force does work on an object and the amount of work done is independent of the path taken.

10.

__Non-conservative force__- when a force does work on an object and the amount of work done is path-dependent.