8Y+Joshua


 * Simple machine: a simple machine is one of the six basic machines **
 * compound machine, **
 * force multiplier, **
 * distance multiplier, **
 * speed multiplier, **
 * mechanical advantage: a measure of the force achieved by using the machine **
 * lever (first, second and third class): a first class lever **
 * inclined plane: a plane that is raised **
 * wedge: a triangular shaped object **
 * screw: a screw **
 * wheel and axle: a wheel with an axle that goes in the middle of the wheel **
 * pulley: a device that makes lifting objects easier by using gears **
 * gears: toothed wheels **
 * cams, **
 * cogs, **
 * effort: effort is how much force is needed for using a simple machine **
 * fulcrum (pivot): the pivot of a simple machine **
 * load: resistance **
 * energy: the ability to work **
 * work: an action that causes progress **
 * force: a force is a push, pull, or twist **
 * friction: contact between objects **
 * mass: how heavy something is without gravity **
 * weight: how heavy something is with gravity applied **
 * spring balance: a measuring tool for weight **