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Physical Science Chapter 14 - Work, Power, and Machines

Physical Science, Concepts in Action

workthe product of force and distance
powerthe rate of doing work
horsepowerequal to about 746 watts
joulethe product of force and distance resulting in the units of newton-meters. The SI unit of work
wattThe SI unit of power
machinea device that changes a force
input distancethe distance the input force acts through
output forcethe force that is exerted by a machine
work outputthe output force multiplied by the output distance
input forcethe force you exert on a machine
work inputthe work done by the input force acting through the input distance
output distancethe distance the output force is exerted through
mechanical advantagethe number of times that the machine increases an input force
actual mechanical advantagethe ratio of the output force to the input force
ideal mechanical advantagethe mechanical advantage in the absence of friction
efficiencythe percentage of work input that becomes work output
levera rigid bar that is free to move around a fixed point
fulcrumthe fixed point that the bar rotates around
input armthe distance between the input force and the fulcrum
output armthe distance between the output force and the fulcrum
wheel and axlea simple machine that consists of two disks or cylinders, each one with a different radius
inclined planea slanted surface along which a force moves an object to a different elevation
wedgea V-shaped object whose sides are two inclined planes sloped toward each other
screwan inclined plane wrapped around a cylinder
pulleya simple machine that consists of a rope that fits into a groove in a wheel
compound machinea combination of two or more simple machines that operate together


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