DEFINITIONS 
DEFINITIONS
| Pulley | A pulley is a simple machine that uses grooved wheels and a rope to raise, lower or move a load. |
| Wheel and Axle | A wheel with a rod, called an axle, through its center lifts or moves loads. |
| Wedge | A wedge is an object with at least one slanting side ending in a sharp edge, which cuts material apart. |
| Screw | A screw is an inclined plane wrapped around a pole which holds things together or lifts materials. |
| Lever | A lever is a board or bar that rests on a fulcrum. An object that a lever moves is called the load. The closer the load is to the fulcrum the easier it is to move. |
| Inclined Plane | An inclined plane is a flat surface that is higher on one end. It is used to move an object to a lower or higher place. Inclined planes make the work of moving things easier. You need less energy and force to move objects with an inclined plane. |
| Fulcrum | The turning point on a lever. |
| Friction | A force that resists motion and makes work harder when things rub together. |
| Work | Force x distance or moving an object over a distance (W = F x D) |
| Effort Force | The pushing or pulling you do to move the object |
| Mechanical Advantage | Number of times a machine multiplies the effort force |
| Resistance Force (load) | The object you are trying to lift/move. |
| Energy | The ability to do work |
| Potential Energy | Energy of position or STORED energy |
| Kinetic Energy | Energy in MOTION. |