1. Levers

2. Definition
• A simple machine
• A board or bar that rests on a turning
point called the fulcrum
• Used to change the amount, the
strength and the direction of
movement.
• The position of the force and the load
can be changed by moving them to
different points on the lever.

3. Definition
• The position of the force and the load
can be changed by moving them to
different points on the lever.
• An object that a lever moves is called
the load or load force.
• The force used to move a lever is
called the effort force.
• The closer the object is to the
fulcrum, the easier it is to move.

4. 1st
Class or Class 1 Lever
• The load force and
the effort force are
separated by the
fulcrum
• As one moves up the
other moves down.
• The amount and the
strength of the
movement is depends
on the distance from
the fulcrum
http://www.hometrainingtools.com

5. Remember:
The force that is pushing down is the EFFORT FORCE
The force of the load or weight is the LOAD FORCE

6. 2nd
Class or Class 2 Lever
• The load force is
between the effort
force and the
fulcrum.
• This lever uses
mechanical
advantage to make
moving large
weights easier.
http://www.hometrainingtools.com

7. Remember:
The force that is pushing down is the EFFORT FORCE
The force of the load or weight is the LOAD FORCE

8. 3rd
Class or Class 3 Lever
• The effort force is
between the
fulcrum and the
load.
• Mechanical
advantage is
reduced but more
movement is
possible.
http://www.hometrainingtools.com

9. Remember:
The force that is pushing down is the EFFORT FORCE
The force of the load or weight is the LOAD FORCE

10. http://lpc1.clpccd.cc.ca.us/lpc/DivisionIII/images/DSNT/Levers.jpg