Question: (1) Define 3 classes of mechanical levers. Use sketches to label
external resistance R, muscle ef…


(1) Define 3 classes of mechanical levers. Use sketches to label
external resistance R, muscle effort E, and their moment arms from
the fulcrum.

(2) What lever class do the following joints belong to?
a) glenohumeral joint: abducted arm kept in equilibrium by the
deltoid muscle
b) pelvis in equilibrium during single limb stance
c) knee joint in equilibrium during stair climbing
d) elbow joint in equilibrium by the action of biceps

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