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Chapter 14 Vocab
Andrews
Question | Answer |
---|---|
work | the product of force and distance |
power | the rate of doing work |
joule | the SI unit of work |
watt | the SI unit of power |
horse power | equal to 746 watts |
machine | device that changes a force |
input force | the force you exert on a machine |
input distance | the distance the input force acts in a machine |
work input | the work done on a machine as the input force acts through the input distance |
output force | the force exerted by a machine |
output distance | the distance an output force acts through in a machine |
work output | the work done by a machine as the output force acts through the output distance |
mechanical advantage | the number of times that a machine increases an input force |
actual mechanical advantage | the ratio of the output force to the input force in a machine |
ideal mechanical advantage | the mechanical advantage of a machine in the absence of friction |
efficiency | the percentage of the work input that becomes work output in a machine |
lever | the rigid bar that is free to move around a fixed point |
fulcrum | the fixed point a lever rotates around |
input arm | the distance between the fulcrum in a lever and the input force |
output arm | the distance between the fulcrum in a lever and the output force |
wheel and axle | a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius |
inclined plane | a slanted surface along which a force moves an object to a different elevation |
wedge | a v-shaped object whose sides are tow inclined planes sloped towards each other |