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Class 1 lever
A lever in which the fulcrum is between the load and the effort. (ex. pair of scissors,
seesaw, crowbar)
class 2 lever
A lever in which the load is between the fulcrum and the effort. (ex. bottle opener,
nut cracker, brake pedal of a car)
class 3 lever
A lever in which the effort is between the fulcrum and the load. (ex. a pair of
tweezers, hole puncher, human mandible (jaw))
lever mnemonic
fre123
lever
amplifies an input force to provide a greater output force
gear
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