| A | B |
|---|
| Work | The product of force and distance |
| Joule | SI units for work |
| Power | The rate of doing work |
| One horsepower | About 746 watts |
| Watt | Joule per second |
| Machines | Make work easier |
| Actual Mechcanical Advantage (AMA) | Output force divided by input force |
| Ideal Mechanical Advantage (IMA) | Input distance divided by output distance |
| Efficiency | Work output divided by work input |
| Lever | A rigid bar that is free to rotate around a fixed point |
| 1st class lever | fulcrum is located between the input force and output force |
| 2nd class lever | Output force is between the input force and fulcrum |
| 3rd class lever | Input force is is between the fulcrum and the output force |
| Wheel and axle | Two disks, each with a different radius |
| Inclined plane | Slanted surface used to move an object to a different elevation |
| Wedge | Two inclined planed sloped toward each other |
| Screw | an inclined plane wrapped around a cylinder |
| Fixed Pulley | Changes only the direction in an input force |
| Movable Pulley | Changes the direction and size of the input force |
| Friction | Causes AMA to be less than IMA |
