inbound2772655900034201706.pdf lever system in human body

Lever system in human body

1. The Lever System
in Human Body
JOHN WILMER F. LAUREANO
Biomechanics Instructor

2. What is Lever System?
Alever systemis a rigid bar that moves on
a fixed point called the fulcrum when a
force is applied to it. Movement is made
possible in the human body bylever
systems that are formed by our muscles
and joints working together.

3. Levers can be used so that a small force
can move a much bigger force. This is
called mechanical advantage. In our
bodies bones act as lever arms, joints act
as pivots, and muscles provide the effort
forces to move loads. There are four parts
to a lever – lever arm, pivot, effort and
load.
What is Lever?

4. Fulcrum/Pivot
LEVER ARM
Four parts of the lever
Effort
Load/
Resistance

5. The lever in human body
BONE
Joints
Muscles
Lever Arm
Fulcrum/Pivot
Effort and
Resistance/Load

6. Fulcrum/Pivot
LEVER ARM
There are Three (3) Classes of Lever System
Effort
Load/
Resistance
FIRST CLASS

7. Fulcrum/Pivot
LEVER ARM
There are Three (3) Classes of Lever System
Effort
Load/
Resistance
2ND CLASS

8. Fulcrum/Pivot
LEVER ARM
There are Three (3) Classes of Lever System
Effort
Load/
Resistance
3RD CLASS

9. Fulcrum/Pivot
LEVER ARM
ACTIVITY
Effort
Load/
Resistance
3
rd
Class Lever

10. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

11. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

12. Fulcrum/Pivot
LEVER ARM
ACTIVITY
Effort
Load/
Resistance
3
rd
Class Lever

13. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

14. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

15. Fulcrum/Pivot
LEVER ARM
ACTIVITY
Effort
Load/
Resistance
3
rd
Class Lever

16. Fulcrum/Pivot
LEVER ARM
ACTIVITY
Effort
Load/
Resistance
2nd Class Lever

17. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

18. ACTIVITY
Fulcrum/Pivot
Effort
Load/
Resistance
A.
B.
C.

19. END OF DISCUSSION