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Lever system in human body.pptx

#LEVER SYSTEM #lever system in human #classification of lever #lever of speed #lever of stability #lever of power #part of lever #mechanical advantage of lever #most common type of lever in human body

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Lever system in human body
Suparna Bandyopadhyay
MPT Neurology
Definition:
The lever is a rigid bar that moves around a fixed fulcrum
with two forces applied to it.
▪ Fulcrum:
It is a fixed pivot point.
The fulcrum lies in the joint of the human body
 Resistance: The weight or load that has to be moved
Internal resistance: Body weight
External resistance: Gravitational force
 Effort: The source of energy that will do the work
In the human body effort point lies in the insertional point of muscles
Fulcrum
Load
Effort
Effort arm : Distance between the effort and the fulcrum.
Resistance arm : Distance between the Load and the fulcrum
First class lever – the fulcrum is in the middle of the effort and the
load.
Second class lever – the load is in between the fulcrum and the
effort.
Third class lever – the effort is between the fulcrum and the load.
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Lever system in human body.pptx

  • 1. Lever system in human body Suparna Bandyopadhyay MPT Neurology
  • 2. Definition: The lever is a rigid bar that moves around a fixed fulcrum with two forces applied to it.
  • 3. ▪ Fulcrum: It is a fixed pivot point. The fulcrum lies in the joint of the human body  Resistance: The weight or load that has to be moved Internal resistance: Body weight External resistance: Gravitational force  Effort: The source of energy that will do the work In the human body effort point lies in the insertional point of muscles
  • 5. Effort arm : Distance between the effort and the fulcrum. Resistance arm : Distance between the Load and the fulcrum
  • 6. First class lever – the fulcrum is in the middle of the effort and the load. Second class lever – the load is in between the fulcrum and the effort. Third class lever – the effort is between the fulcrum and the load.
  • 8.  Resistance and effort are equidistant from the fulcrum  The effort is closer to the fulcrum than the load, the lever provides no mechanical advantage but increases the speed with which the load can move  The distance from the effort to the fulcrum is long and the distance from the load to the fulcrum is short. A small effort can move a large load  Lever of “equilibrium and stability”
  • 11. A second-order lever is a machine with the effort and resistance on the same side of the fulcrum, with the effort force furthest from the fulcrum.  Lever of “power”  The mechanical advantage is always more than 1 as the effort arm is longer than the load arm
  • 13. A second-order lever is a machine where the effort lies between the fulcrum and resistance  The effort arm is always smaller than the resistance arm, mechanical advantage is always less than 1  The most frequent type of lever present in the human body  Lever of “speed”
  • 15. 1st order lever Lever of stability 2nd order lever Lever of power Lever of speed 3rd order lever Most common type of lever seen in the human body?