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Using the data you have gathered and your knowledge of the law of conservation of angular momentum, explain the results for the angular momentum data column.
physics 3.28.docx

Anne Itkin
2/25/11
assignment 3.28
Procedure:
1. Visit The A. James Clark School of Engineering Virtual Lab Site: Conservation
of Angular Momentum
2. In the Inputs box, select the decreasing radius button.
3. Select various combinations of values for the mass of the ball, the initial
radius, the normal velocity (must be greater than zero), and initial tangential
velocity. To start your trial runs, click the rotate button.
4. To complete the lab, select one of your combinations from #3, set the initial
radius to 1.90 m, and use the step>> button to rotate in increments. Enter your
data from the Outputs box in the data table.
5. Make a graph using the measured quantities with radial distance on the x-axis
and tangential velocity on the y-axis. Refer to Module 1.08 and 1.13 for graphing
tips.
6. Answer the questions and write a conclusion. Refer to lesson 1.20 for lab tips.

Data:
Radial
Distance(m)
1.85
1.40
1.00
0.80
0.60
0.40

Tangential Velocity(m/s)
1.0
2.0
3.0
4.0
5.0
6.0

Angular Momentum (kg m2/s)
(in red above the rotating ball)
0.19
0.14
0.60
0.96
1.20
1.20

Graph:

Questions:
1.Using the data you have gathered and your knowledge of the law of
conservation of angular momentum, explain the results for the angular
momentum data column.

2. Find line or curve of best fit. What is the constant for this graph? Refer to
lesson 1.13 for tips.

3. Using your knowledge of graphs, describe the relationship between radial
distance and tangential velocity.

4. Visit the following site: Conservation of Angular Momentum Demonstration .
Play the video. Explain the changes in the womans speed as she moves her
arms.

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