What are the three components of a lever?
Fulcrum
Resistance
Effort
Give a action that is a first class lever
Draw one
Elbow extension
Sheet: Levers A
Give a action that is a second class lever
Draw one
Plantar flexion of ankle
Sheet: Levers B
Give a action that is a third class lever
Draw one
Everything else
Sheet: Levers C
What levers are in mechanical advantage?
2nd
What levers are in mechanical disadvantage?
1st and 3rd
Describe mechanical advantage
Effort arm is larger than resistance arm
+Less effort to over come a heavy resistance
-Don’t have great speed
-Don’t have a great range of movement
Describe mechanical disadvantage
Resistance arm is larger than the effort arm
+Apply more speed
+Increases range of movement
-Takes large effort to overcome resistance