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Science 7 12-2

QuestionAnswer
machine allows you to work easier
input force force you exert on machine
output force force machine exerts on object
3 ways to make work easier change force, change distance, change direction
pulley changes direction of exerted force
hockey stick changes distance
ramp changes force
mechanical advantage ratio of output force to input force
increase force increase mechanical advantage
increase distance decrease mechanical advantage
change direction mechanical advantage does not change
ideal machine 100% efficient
real machine efficiency less than 100% (due to friction)
Created by: jmeager
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