This document provides an overview of work, power, simple machines, and energy. It defines work as the product of force and distance moved, and power as the rate of doing work. Simple machines make work easier by changing the magnitude or direction of force applied, but do not change the total work done. Mechanical advantage is the ratio of resistance force to effort force. Efficiency is the ratio of output work to input work. Potential energy is stored energy due to an object's position or state, while kinetic energy is due to an object's motion. The law of conservation of energy states that within a closed system, total energy remains constant as it transfers between kinetic and potential forms.

1. Chapter 10 Work, Power & Simple Machines

13. Chapter 11 Potential and Kinetic Energy