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 woman’s speed as she moves her

arms.