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Chap 5 Physical Sci
| Question | Answer |
|---|---|
| Work | A transfer of energy that occurs when a forces makes an object move |
| Power | the amount of work done in one sec. the rate at which work is done |
| machine | device that make doing work easier |
| input force | the force applied to rhe machine |
| output force | the force applied by the machine |
| mechanical advantage | The ratio of the output force to the input force |
| efficiency | a measure of how much of the work put into a machine is changed into useful output work by the machine. |
| simple machine | a machine that does work with only one movement of the machine |
| Lever | a bar that is free to pivot or turn around a fixed point |
| pulley | a grooved wheel with a rope, chain, or cable running along the groove. |
| wheel and axle | a simple machine consisting of a shaft or axle attached to the center of a larger wheel, so that the wheel and axle rotates together. |
| inclined plane | simple machine that consists of a sloping surface, such as a ramp that reduces the amount of force needed to life something by increasing the distance over which the force is applied. |
| screw | an inclined plane wrapped in a spiral around a cylindrical post. |
| wedge | a inclined plane with one or two slopped sides that changes the direction of the input force |
| compound maching | two or more simple machines that operate together. |
Created by:
drew274
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