| A | B |
|---|
| work | transfer of energy through motion |
| simple machine | device that makes work easier with only one movement |
| effort force | Fe |
| resistance force | Fr |
| work input | work done on the machine |
| work output | work done by the machine |
| Win= | Fe x de |
| Wout= | Fr x dr |
| Win=Wout | ideal machine |
| mechanical advantage | # of times a machine multiplies the Fe |
| Pulley | lever-like |
| Wedge | Moving inclined plane |
| Wheel and axle | lever-like |
| Fulcrum | fixed point of a lever |
| effort arm | part of the lever to which the Fe is applied |
| resistance arm | part of the lever that exerts the Fr |
| IMA of a lever | Le/Lr |
| First class lever | fulcrum in between aht Fe and Fr |
| Second class lever | always multiplies the Force |
| Third class lever | increases the speed |
| block and tackle | combination of a fixed and a movable pulley |
| fixed pulley | IMA = 1 |
| fixed pulley | does not multiply the Fe |
| movable pulley | IMA greater than 1 |
| movalbe pulley | multiplies the Fe |
| IMA of a wheel and axle | radius of wheel/radius of axle |
| inclined plane | IMA= l/h |
| compound machine | 2 or more simple machines |
| mechanical efficiency | (Wout/Win) x 100% |
| power | Work/time |
| J/s | Watt |
| Watt | measurement of power |
| power | rate at which energy is converted |
| 1 horsepower= | 745.56 W |
