| A | B |
|---|
| Work | Force x Distance |
| Joule | SI unit of work |
| Power | Work/Time |
| Watt | SI unit for power = 1 Joule/second |
| Horsepower | About 746 watts |
| Machine | a divice that changes a force |
| Input Force | Force exerted on a machine |
| Input Distance | the distance through which the imput force acts in a machine |
| Work Input | the work done by a machine as the output force acts through the output distance |
| Output Force | the force exerted by a machine |
| Output Distance | the3 distance an output force acts through in a machine |
| Work Output | the work done by a machine as the output force acts through the output distance |
| Mechanical Advantage | the number of times that a machine increases an input force |
| Actual Mechanical Advantage | the ratio of the output force to the input force of a machine |
| Ideal Mechanical Advantage | the mechanical advantage of a machine in the absence of friction |
| Efficiency | the percentage of the work input that becomes work output in a machine |
| Lever | a ridgid bar that is free to move around a fixed point |
| Fulcrum | The pivot point of a lever |
| Input Arm | the distance between the fulcrum in a lever and the input force |
| Output Arm | the distance between the fulcrum in a lever and the output force |
| Wheel and Axle | a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius |
| Inclined Plane | a slanted surface which a force moves an object to a different elevation |
| Wedge | a V-shaped object whose sides are two inclined planes sloped at each other |
| Screw | inclined plane wrapped around a cylinder |
| Pulley | a simple machine that consists a rope that fits into a groove in a wheel |
| Compound Machine | two or more simple machines combined working together |
