8Y+Will


 * __Key words__ **

**Simple machine-** **compound machine-** **force multiplier-** **distance multiplier-** **speed multiplier-** **mechanical advantage-** **lever (first, second and third class)-** **inclined plane-** **wedge-** **screw-** **wheel and axle-**

**pulley-** **gears-** **cams-** **cogs-** **effort-** **fulcrum (pivot)-** **load-** **energy-** **work-** **force-** **friction-** **mass-** **weight-** **spring balance-**