Lever System (basic concepts of biomechanics) Physiotherapy class
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summary of the video with the time for reference:
1.Torque and Lever system
-Lever-rigid body
-Fulcrum-fixed point
- Torque = Force x MA
-Moment arm is always parpandicular distance from line of force to fulcrum
2.Lever System
-FREE
First class fulcrum is in the center
-Second class -Resistance arm is in the center
Third class Effort arm is in the center
-Effort arm always wins and resistance arm always looses
3.First class lever system
-like a see saw
-Resistance arm can be greater than, equal to, or less than effort arm
-flexion extension of head at occiput
-Abduction and adduction at shoulder joint
3.Second class lever system
-Effort arm greater than the resistance arm
-Ankle planter flexion
-Elbow flexion with brachioradialis action
3.Third class lever system
-Effort arm less than the resistance arm
-Knee extension with quadriceps
-Elbow flexion with biceps action
#centreofmass #centreofgravity