PASCO ME-6807A Human Arm Model User Manual
Page 10
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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 1 : B i c e p s F o r c e v e r s u s P e r p e n d i c u l a r L o a d
10
Procedure
1.
Start data collection.
2.
Hook the second force sensor onto to the model’s hand and
pull in the direction indicated in the illustration. Slowly
increase the force while watching the graph.
3.
When the load force reaches about 2 N, stop data collection.
Analysis
1.
Using words and numbers, explain the relationship between load force and
biceps force.
2.
Were your predictions accurate? Explain.
Further Analysis
1.
Draw a free-body diagram showing all forces (in the plane of rotation) acting on
the forearm.
2.
What is the net force on the forearm?
3.
What is the net torque?
Further Study
1.
Repeat the experiment with the elbow at a different angles, but keep the load
force perpendicular to the forearm. How does the ratio of biceps force to load
force change for elbow angles greater and less than 90°?
2.
Repeat the experiment with the cord attached at the other two biceps insertion
points.
Force Sensor 2
(Load Force)
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