| A | B |
|---|
| load | the weight that you are trying to move |
| effort | the force applied to an object or a machine |
| class 1 lever | the fulcrum is between the load and the effort |
| class 2 lever | the load is between the fulcrum and the effort |
| class 3 lever | the effort is between the fulcrum and the load |
| mechanical advantage | the number of times a force exerted on a machine is multiplied by the machine |
| single-fixed pulley | the pulley is attached to a solid structure |
| single-movable pulley | the pulley is attached to the object you wish to move |
| compound pulley | a combination of both fixed and movable pulleys |
| block and tackle | a special type of compound pulley in which the single and movable pulleys are side by side |
| directional advantage | a change in direction that results from passing a rope through a pulley |
| inclined plane | a flat slanted surface such as a ramp |
| input force | the force with which you push or pull an object |
| output force | the force you would need to lift the object without the simple machine |
| wedge | a device that is thick at one end and tapers to a thin edge at the other end |
| screw | an inclined plane wrapped around a cylinder |
| lever | a rigid bar that is free to pivot about a fixed point |
| fulcrum | the fixed point that the lever pivots around |
| wheel and axle | made of two circular or cylindrical objects that are fastened together and that rotate around a common axis |
| pulley | a grooved wheel with a rope wrapped around it |
| compound machine | consists of 2 or more simple machines that work together |
