2.  the simplest device that performs work.  classified as: lever, pulley, wheel and axle, inclined plane, wedge, and screw.

3.  machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum  an object that acts as a pivot point that multiplies the force that can be applied to another object.

4.  simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.

5.  a wheel attached to an axle so that these two parts rotate together in which a force is transferred from one to the other. Axle

6.  a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load

7.  a type of fastener characterized by a helical ridge, known as an external thread or just thread, wrapped around a cylinder

8.  a simple machine used to separate two objects, or portions of objects, through the application of force

9. Machines do not change work but make it easier by either changing the magnitude or the direction of the force.