16+Machines

=Chapter 16= =Machines=

**You Learned...**

 * ====Work is done when a force moves an object.====
 * ====Machines help people do work.====
 * ====There are six types of simple machines.====
 * ====A lever, inclined plane, wedge, screw, wheel and axle, and pully can be used to do work.====
 * ====Simple machines combine to make compound machines.====