PASCO ME-6807A Human Arm Model - Manual (Page 20)

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H u m a n A r m M o d e l E x p e r i m e n t 6 : B i c e p s F o r c e v e r s u s E l b o w A n g l e , C o n s t a n t F o r e a r m
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7. Prepare a graph to plot biceps force versus elbow angle.
Procedure
1. Start data collection.
2. Push the upper arm to rotate the shoulder from 0 degrees to about 85 degrees.
(Don’t touch the forearm or force sensor as you do this.) The elbow will automat-
ically extend.
3. Stop data collection.
Analysis
1. As the arm pushes the mass forward, does the elbow angle increase or decrease?
2. Does the biceps force increase or decrease as the arm pushes the mass forward?
(Note that the extending motion of the arm is represented by right-to-left move-
ment on the graph.)