levers

 

a lever is a simple machine that uses the turning effect of a force

eg: can openers, scissors, tongs, spanners, hammers, brooms, tennis racquets, staplers

 

fulcrum

the turning point of a lever is called its fulcrum

 

load

the resistance to motion that a lever works against is called the load

 

effort

the force used to cause movement is called the effort

 

check out this video

http://www.youtube.com/watch?v=6DqaNb0Rl0M

 

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