Levers & Limbs

  • Due Oct 13, 2016 at 8:59am
  • Points 2
  • Questions 2
  • Available until Oct 13, 2016 at 8:59am
  • Time Limit None
  • Allowed Attempts Unlimited

Instructions

Watch the following video tutorial on mechanical levers and animal limbs.
http://youtu.be/-dzXjZWa-vI

[PDF of Slides]

Summary:

• Lever converts an effort force into a load force by ratio of distances to the fulcrum.
• Three classes of levers, depending on the positions of the fulcrum, effort and load.
• Limbs operate as levers with the fulcrum at the joint and muscles exerting effort.
• Most levers in the body are inefficient (large effort force) but fast (small muscle contraction moves load by large distance).
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