8Y+Amanda

**compound machine -** Two or more simple machines combined and placed together. **force multiplier -** Tool that helps to increase the amount of effort input to result in more effort output. **distance multiplier -** Tool that increases the amount of distance travelled by decreasing the amount of effort needed to travel a greater distance. **speed multiplier -** Tool that increases the amount of speed by decreasing the amount of effort needed to travel a greater speed.
 * Simple machine -** Basic mechanical device that use force to make work easier.

**mechanical advantage -** The ratio of effort input to effort output **lever (first, second and third class) -** A stiff bar that lays on a fulcrum which moves or lifts loads.

**inclined plane -** A slanted surface that connects a low surface to a higher one. **wedge -** An object with slanted edges, which ends in a sharp point. Used to cut items. **screw -** An inclined plane wrapped around a pole. **wheel and axle -** A wheel with an axle (rod) through the middle of it. Lifts or moves loads. **pulley -** A simple machine that uses rope or string and a grooved wheel(s) to move items up or down. **gears -** Toothed wheels that combine to move together. Changes speed or direction. **cams** **cogs** **effort -** Force exerted, your input. **fulcrum (pivot) -** The point at which a simple machine rotates or moves. **load -** The resistance **energy** **work** **force** **friction** **mass** **weight** **spring balance**