1. In your own words, describe the situation to be studied in thisexperiment.
2. List and define all of the parameters that will be measured directly.
3. List and define any quantity that will be calculated.
4. List any graphs that will be created during your analysis of thisexperiment.
1. The three penudlum-bob's that you will use this week are (1) a billiardball, (2) an aluminum cylinder, and (3) a small lead cylinder.
2. When measuring the length of the pendulum, L, measure from the top endof the string to the center of mass of the bob. This means that L = the lengthof the string plus the distance from the point where the string is attached tothe center of mass of the bob. The lab manual asks you to use lengthsapproximately equil to 1.5 m, 1.2 m, 0.8 m, and 0.5 m. Hang your pendulum ata length closely approximate to these and then record the exact lengthfor your pendulum in each case rather than spending alot of time trying to makeyour pendulum hang at exactly those lengths.
3. Position the photogate so that the bob sits directly in the center of thephotogate when it hangs at rest. Adjust the height of the photogate so thatthe "eye" on the photogate is at the same height as the center of the bob.
4. In procedure 4, it will be difficult for L to be exactly the same for allthree bobs. You should, however, keep the length as close as possible. Usethe position of the photogate that you set for the first bob to help youposition the other bobs at the correct height.
1. Your results section should include a table containing your calculatedvalues of g for each of the three bobs at each of the four lengths.
2. Compare your calculated values of g to the known value for Milwaukee:gM = 9.803 m/s2. (Give both a verbal comparison and amathematical percent error.)
3. Make a graph of g vs L using all twelve values of g. Use a differentpoint marker for each type of pendulum bob. For example, squares for thealuminum bob, diamonds for the lead bob, and circles for the billiard ball. Draw the best straight line through each set of points. (You will have 3 lineson the graph.)
4. Discuss the amount of scatter present for each of the three lines. Explain as thoroughly as possible the factors that affect the amount ofscatter, paying particular attention to the geometry of the individual bobs.
5. Did the angle of the pendulum swing affect your results? How could youdetermine the effect of the angle?
| Section | Points |
|---|---|
| Purpose | 1 |
| Results | 4 |
| Calculations | 3 |
| Graphs | 3 |
| Analysis | 10 |