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Chapter 14 Vocab

Andrews

QuestionAnswer
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