PASCO ME-6807A Human Arm Model User Manual
Page 12
®
H u m a n A r m M o d e l
E x p e r i m e n t 2 : B i c e p s F o r c e v e r s u s W e i g h t
12
Procedure
1.
Start data collection.
2.
Hook the second force sensor onto to the model’s hand and
pull down to simulate a weight held in the hand. 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
Repeat the experiment with the elbow at different angles. The applied force should
always be straight down to simulate the weight of a mass held in the hand. How does
the relationship between biceps force and load force change for elbow angles greater
and less than 90°?
Variation
Instead of using a force sensor to apply the load force, hang a known mass from the
hand. Add mass incrementally while measuring biceps force.
Force Sensor 2
(Load Force)
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