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P.S ch4a

QuestionAnswer
energy the ability to cause change
mechanical advantage the ratio of output force to input force Fout/Fin
joules the SI unit for energy and work
work the force applied through a distance; w=fd
simple machine does work with only one movement of the machine
compound machine a combination of two or more simple machines
inclined plane the longer the inclined plane, the less force required to raise an object in the same distance. (increases force)
wheel and axle a circular component that rotates on a rod on the center. makes it easier to turn smth(speed up)
lever reduces the amt of effort required to do smth. a rigid box that pivots around a fixed point (redirects force)
pulley a grooved wheel with a rope or cable wrapped around it. makes effort less than half the weight of the load.(increase and redirects
wedge a movable inclined plane. changes the direction of the force.(redirects)
screw an inclined plane wrapped around a shaft or post to form a spiral. more turns required = less force. (redirects force)
efficiency Wout/Win(100%) work out divided by work in time 100%
power energy/time and work/time
Created by: bittsygirl
 

 



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