3 Classes of Levers

F

1

L

2

E

3

a can opener

a pair of pliers

A first-class lever is a lever in which the fulcrum is located in between the effort and the load. This is the lever that you think of whenever you think of

levers.

a see-saw

a pair of scissors

a hammer

(when its used to pull nails)

nails clipper

1st Class has fulcrum in

the middle.

2nd Class has load in the

middle.

3rd Class has effort in the

middle.

F

L

E

F

L

E

F

L

E

F

L

E

F

L

E

F

L

E

E

E E

a paper cutter

a nut-cracker

The second-class lever is a little strange.In a second-class lever, the load is between the

fulcrum and the effort.

a wheel-barrow

a bottle opener egg slicer

a broom

a fishing rod

(your elbow or wrist is the fulcrum)

This fellow is the oddest of all. The third-

class lever has the effort between the load

and the fulcrum.

a baseball bat

tweezers

your arm

a stapler

a hammer

(when its used to hammer nails)

E

F

L

E

E

F L

E

E

F

L

F

L

L

E

F

E F

L E

E

F

L

E

E

F

L

F

L

E F

L

E

F

L

F

L