PASCO Human Arm Model Revisited

PASCO Human Arm Model Revisited

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?
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 :-orce 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
I::
NOTE: Click on hardware configuration and change the sign of the force sensor to reflect positive values for tension. Insert an appropriate curve fit into the graph after data collection is complete.
1. Start data collection. 2. Pull with the force sensor to slowly flex the elbow from about 5′ to 130′. 3. Stop data collection.
Analysis