PASCO ME-6807A Human Arm Model - Manual (Page 15)

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15
Experiment 4: Biceps Curl
Part A
Introduction
Let your arm hang vertically at your side. Hold a mass in your hand. Without moving
your upper arm, flex your elbow to lift the mass.
Predictions
1. As you lift the mass, does your biceps force increase
or decrease?
2. Sketch your prediction of the biceps force versus elbow
angle graph.
Set-up
1. Install the 100 g mass on the model’s hand.
2. Clamp the arm model vertically as illustrated.
3. Lock the shoulder at 0°.
4. Attach a cord and force sensor as illustrated. You will hold the force sensor in
your hand and pull to make the model’s elbow flex.
5. Connect the arm model to the angle sensor. Connect the angle sensor and force
sensor to your interface.
6. Set the sampling rate of the force sensor to 20 Hz.
7. Prepare a graph to plot biceps force versus elbow angle.
Procedure
1. Start data collection.
2. Pull with the force sensor to slowly flex the elbow from about 5° to 130°.
Required Parts of Human Arm Model
Arm
Cord (1 piece)
100 g mass
Other Required Equipment
Angle Sensor PS-2139
Force Sensor PS-2104 or PS-2189
C-clamp SE-7286 (6-pack)