LEVERS

1
LEVERS
2
Fulcrum The fixed point
3
The fulcrum is between the effort and the
resistance. Changes size and direction of the
effort.
4
First class lever
5
The resistance is between the effort and the
fulcrum. Used to help overcome large resistance
with relatively small force.
6
Second class lever
7
The effort is between the resistance and the
fulcrum. Does not multiply the force. Used to
gain speed or distance.
8
Third class lever
9
Mechanical Advantage

• Lever MA length of effort arm length of
  resistance arm.
• Lever MA resistance force effort force

Mechanical Advantage? Mechanical
Advantage? Mechanical Advantage?
Yes!!!!!!!!
N0! harder
No! same
10
Compound machines

• A combination of two or more simple machines.