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Science chap 11 + 12
chap. 11 sec. 4, chap. 12 sec. 1+2
| Question | Answer |
|---|---|
| Bernoulli's principle | rule that states that a stream of fast-moving fluid exerts less pressure than the surrounding fluid |
| work | when you exert a force on the object that causes the object to move some distance |
| joule | unit of work equal to one newton-meter |
| efficiency | output work/ iput work x 100% |
| mechanical advatage = | output force/ input force |
| work = | force x distance |
| machine | device that changes the amount of force exerted or the direction in which force is exerted |
| input force | force exerted on a machine |
| output force | force exerted on an object by a machine |
| ideal mechanical advantage | mechanical advantage that a machine would have without friction |
| actual mechanical advantage | mechanical advatage that a machine provides in a real situation |