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 Pasco 500 Interface to take the data, similarly towhat was done in the falling body lab. The Motion Detector (hereafter referedto as the Ranger) is a digital interface, so use the digital plug icon toconnect the Ranger to Channel 1. We will be using both the Table and the Graphto study the data. Set your Graph axes as follows: minimum x = 0, maximum x =15 s, minimum y = 0, and maximum y = 2.0 m.
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 reach the 2.0 second mark (or some other easilyvisible time interval).
6. Use the sigma button to use the statistics tools. The acceleration can befound using a polynomial fit of the parabolic section of your data, againsimilar to the falling bodies lab.
7. Create a graph on the screen that shows a clean set of data for each ofthe five different hanging masses. If you started from a consistent height andat a consistent release time, you should be able to clearly show all of yourdata on a single graph. Copy this graph to Quattro Pro or to Notepad and thensave it to your disk so that you can print it later.
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.
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. As in Part A, create a graph that shows a clean data set for each of thefour rims. Copy this graph to Quattro Pro or to Notepad and then save it toyour disk so that you can print it later.
5. Ignore Table 3, there is no part C.
1. Your results section should include statements of the relationshipbetween the size of the applied force and the angular acceleration and between the location of the applice force and the angular acceleration as shown by yourdata.
2. Describe the two graphs you made showing all the runs for Part A and allthe runs for Part B. 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 #3?
| Points | |
|---|---|
| Purpose | 1 |
| Results | 2 |
| Calculations | 3 |
| Graphs | 5 |
| Analysis | 9 |