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9Sci Ch7
CH 7 Vocab 9SCI
Term | Definition |
---|---|
bionics | designing replacement body parts |
compound machine | combination of two or more simple mchines |
efficiency | ratio of useful work put out by a machine to work put into that machine |
effort arm | part of lever where effort force is applied |
fulcrum | the fixed part where a lever pivots |
ideal machine | machine that works 100% efficient; work out = work in |
inclined plane | simple machine containing a sloping surface (ramp) used to raise objects |
lever | simple machine with a bar that is free to pivot (rotate) around a fixed point (fulcrum) |
machine | device that makes work easier |
mechanical advantage | number of times a machine multiples |
power | measure of work doe in a certain time |
pulley | simple machine with a grooved wheel and a rope or chain running along the wheel |
wedge | simple machine with moving inclined plane with one or two sloping sides |
wheel & axle | simple machine that has two different sized wheels that rotate |