1. In your own words, describe the situation to be studied in thisexperiment.
2. List and define any parameters that will be measured directly.
3. List and define any quantities that will be calculated or obtainedthrough a fit of the data.
4. What graphs will you be producing during the collection of the data?
Part A. Changing the Size of the Applied Force.
1. Record the diameters of the four different rims in the table given here:
| Rim | Diameter (m) | Radius (m) |
|---|---|---|
| #1 (inner) | ||
| #2 | ||
| #3 | ||
| #4 (outer) |
2. You will be using the BIB Interface to take the data, similarly towhat was done in the falling body lab.
3. The Ranger should already be in the screen box safety cage. Be surethat the Ranger is sitting on the wooden blocks provided. If the Ranger is setdirectly on the floor, the screen is far enough away from the Ranger that itwill be all that the ranger sees. If the Ranger is placed close to the screen,the ultrasonic pulses ignore the screen itself and focus on reflections fromobjects beyond the screen.
4. Always start the mass from the same height. Line up your hanging mass with some reference point to assure that you have a consistent start height.
5. It isalso important to get a consistent time of release. To do this, turn thecomputer screen so that the person releasing the mass can see it easily. Watchthe screen after the ranger begins recording data and release the mass when yousee the data on the screen show a horizontal line marking the release height.
6. Find the acceleration of the falling mass by using a parabolic fit of thedata. Make sure that the peak of the parabola corresponds to the start heightof the ball.
Part B: Changing the Location of the Applied Force.
1. This time the amount of mass will stay the same, but you will look at thedifferent accelerations which result when that force is applied at differentradii from the rotational axis.
2. Again, use a consistant start time and start height for ease ofcomparison, then use the parabola fit to obtain the acceleration of the fallingmass.
3. Add another column to Table 2 for the Tension, as in Table 1. Also, thereare five rows in Table 2, but only 4 rims on the pulley. Ignore the last row.
4. Ignore Table 3, there is no part C.
1. Your results section should include the equations of the lines for yourtwo graphs.
2. Describe the graphs shown on the screen for Part A and for Part B. What changed between one set of data and the next? Be as thorough as possible in your description. Whatdoes the shape of the graph tell you about the relationships between theapplied force and the angular acceleration and between the location of theapplied force and the angular acceleration?
3.Plot a graph of the angular acceleration versus the magnitude of theapplied force. Is the graph linear? Is the slope positive or negative? Whatdoes this tell you about the relationship between the size of the force and therotation produced? What is the y-intercept of the graph? To what does the yintercept corespond? Does this graph support the conclusions you drew from thegraphs mentioned in Analysis #2?
4. Plot a graph of the angular acceleration versus the location of theapplied force. Is the graph linear? Is the slope positive or negative? Whatdoes this tell you about the relationship between the location of the force andthe rotation produced? What is the y-intercept of the graph? To what does they-intercept corespond? Does this graph support the conclusions you drew fromthe graphs mentioned in Analysis #2?
| Points | |
|---|---|
| Purpose | 1 |
| Results | 3 |
| Calculations | 3 |
| Graphs | 4 |
| Analysis | 9 |