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Sci chapter 8 vocab
| Question | Answer |
|---|---|
| Work | The action that results when a force causes an object to move in the direction of the force |
| Joule | The unit used to express work and energy |
| Power | The rate at which work is done |
| Watt | The unit used to express power |
| Machine | A device that helps make work easier by changing the size or direction (or both) of a force |
| Work Input | The work done on a machine |
| Work Output | The work done by a machine |
| Mechanical advantage | a number that tells how many times a machine multiplies force |
| Mechanical efficiency | a comparison, expressed by a percentage, of a machine's work output with the work input |
| Lever | a simple machine consisting of a bar that pivots at a fixed point, a fulcrum |
| Inclined plane | a simple machine that is a straight, slanted surface |
| Wedge | a simple machine that is a double inclined plane that moves |
| Screw | a simple machine that is an inclined plane wrapped in a spiral |
| Wheel and Axle | a simple machine consisting of two circular objects of different sizes |
| Pulley | a simple machine consisting of a grooved wheel that holds a rope or cable |
| Compound machine | a machine that is made of two or more simple machines |
Created by:
eunbyul
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