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Phys Sci - Chap 14

vocabulary words

QuestionAnswer
work product of the distance and the force in the direction an object moves
joule SI unit of work (J), equal to 1 newton-meter
power the rate of doing work
watt Si unit of power (W), equal to one joule per second
horsepower common unit of power, equal to about 746 watts
machine device that changes a force
input force force exerted on a machine
input distance distance through which the input force acts in a machine
work input work done on a machine as the input force acts through the input distance
output force force exerted by a machine
output distance distance an output force acts through in a machine
work output work done by a machine as the output force acts through the output distance
mechanical advantage number of times that a machine increases an input force
actual mechanical advantage ratio of the output force to the input force in a machine
ideal mechanical advantage mechanical advantage of a machine in the absence of friction
efficiency percentage of the work input that becomes the work output in a machine
lever a rigid bar that is free to move around a fixed point
fulcrum fixed point a lever rotates around
input arm distance between the fulcrum in a lever and the input force
output arm distance between the fulcrum in a lever and the output force
wheel and axle simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius
inclined plane slanted surface along which a force moves an object to a different elevation
wedge V-shaped object whose sides are two inclined planes sloped toward each other
screw inclined plane wrapped around a cylinder
pulley simple machine that consists of a rope that fits into a groove in a wheel
compound machine combination of two or more simple machines that operate together
Created by: msparks