ESS 303

1
ESS 303 Biomechanics

• Levers and Joints

2
Lever Components

• Lever
• Fulcrum
• Effort
• Resistance
• MAE Moment Arm of Effort
• MAR Moment Arm of Resistance
• Three types of levers

3
Levers (Type I)
E
R
F
4
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Levers (Type II)
R
E
F
6
(No Transcript)
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Levers (Type III)
R
E
F
8
(No Transcript)
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Equilibrium of a Lever Formula

• E MAE R MAR
• Question Two children are sitting on opposite
  sided of a balanced sea-saw. One childs body
  mass is 50 Kilograms and he/she is seated 1.5
  meters from the fulcrum. How far from the fulcrum
  is the other child if his/her body mass is 40
  Kilograms?
• Answer 50 Kg 1.5 M 40 Kg X M
• X 1.875 Meters

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Articulations

• Synarthrodial (Sutures of skull)
• Amphiarthrodial (Between vertebrae)
• Diarthrodial (Common)

11
Joints

• Articulations
• Connection point between two bones
• Six basic types of joints in the body

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1 Hinge
13
2 Gliding or Plane
14
3 Condyloid
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4 Pivot
17
5 Ball Socket
18
6 Saddle