PS Chapter 13 Study Guide
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16 terms
Terms | Definitions |
|---|---|
 Zero | If a boy pushes on a parked car with a force of 250 N but the car does not move, how much work is done? |
| Joules | Units of work |
| A Machine | Device that can multiply and change the direction of an input force |
| 1 | Mechanical advantage of a single, fixed pulley |
| Inclined plane | Changes both the magnitude and the direction of the force |
| Pair of scissors | Example of a compound machine |
| Nuclear fusion | Primary source of the sun's energy |
| Power | Quantity that measures the rate at which work is done |
| Time | Power is calculated by dividing work by... |
| Watt | SI unit of power |
| Compound machine | Machine made up of more than one simple machine |
| Potential energy | Stored energy resulting from the relative positions of objects in a system |
| Mechanical energy | Sum of the kinetic and potential energy of large-scale objects in a system |
| Chemical energy | Source of energy when dynamite explodes |
| Screw | Inclined plane wrapped around a cylinder |
| Efficiency | Ratio of useful work output to work input |
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