8Y+Gabi


 * Simple machine:** a device that transmits or modifies force or motion and any of six or more elementary mechanisms, as the lever, wheel and axle, pulley, screw, wedge, and inclined plane.
 * Compound machine//://**A compound machine consists of two or more simple machines put together.


 * First class lever:** the fulcrum is located between the applied force and the load.
 * Second class lever:** the load is situated between the fulcrum and the force.
 * Third class lever:** the force is applied between the fulcrum and the load
 * Inclined plane:**a slanted surface or ramp that helps us move objects up to another height
 * Wedge:** It can be used to separate two objects or portions of an object, lift an object, or hold an object in place. It functions by converting a force was applied to its blunt end into forces perpendicular to its inclined surfaces
 * Screw:** a simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits
 * Wheel and axle:** is a modified lever of the first class] that rotates in a circle around a center point or fulcrum. The larger wheel (or outside) rotates around the smaller wheel
 * Pulley:** is a mechanism composed of a wheel on an axle or shaft that may have a groove between two flanges around its circumference. A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present. Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in either a linear or rotational system of motion


 * Effort:** exertion of physical or mental power
 * Fulcrum (pivot):** The point or support on which a lever pivots
 * Load:** the quantity that can be or usually is carried at one time
 * Energy:** an exertion of power
 * Work:** exertion or effort directed to produce or accomplish something
 * Force:** strength or power exerted upon an object