Procedure:
1. Place one end of a rubber band around the vertical rod on your table.
2. Stretch the rubber band to a length of 10cm beyond its unstretched length, L0.
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3. Place two rubber bands around the rod and stretch them together a length of 10cm
Question 1-1: How does the combined force of two rubber bands compare to the force of just one rubber band?
1. Repeat with 3, 4 5 rubber bands.
Activity 1-2: Measuring Force with a Force Probe
Open file L03A1-2a (Measuring Force.ds)
Procedure:
Note: The Force Probe is attached to a cart.
1. Zero the Force Probe. (With nothing attached to the Probe press "Start" on the control panel and observe the force. If it is not zero press the small button "TARE" on the side of the Sensor and confirm that the force measurement is now zero. If the Force Probe still registers a nonzero force contact your instructor.)
2. Measure the unstretched length of one rubber band and record here: Lo=________
3. Place one end of the rubber band around the vertical rod on the stand.
4. Attach the Force Probe hook to the free end of the rubber band. See Figure 1A on the next page.
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Figure 1A
5. Click "Start" and pull the Force Probe horizontally to stretch the rubber band 10cm (10cm beyond the unstretched length). See Figure 1B below.
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Figure 1B
6. Select the statistics feature [pic] and determine the mean value of the force.
Record the force in Newtons. _______N
7. Now stretch the rubber band 20cm.
Record the force._________N
8. Now stretch the rubber band 30cm.
Record the force._________N
1. Now stretch the rubber band 40cm.
Record the force._________N
2. Record your measurements in Data Table 1.
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