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Unformatted text preview: argest spring constant if you had
nothing but the springs themselves?
Problem 10.12 How could you quantitatively measure the spring constant
of a spring if you had no equipment other than a 150-gram mass and a ruler?
Experiment 2: Simple Pendulum
In this experiment, we will show that the angular frequency of oscillation for a pendulum depends
only on its length and on the gravitational constant, g. Figure 10: The pendulum bobs used in Experiment 2. From left to right, they are: plastic, wood,
brass, and aluminum. 96 1. You have been provided with four different possible pendulum bobs to use for this experiment, all of which have the same geometry. They are: wood, brass, aluminum, and plastic.
A picture of the four bobs is shown in Figure 10. The center of mass of each cylindrical bob
is marked on it in pen. Choose one of the bobs and attach it to the end of a 1.5-meter piece
of black nylon string. Clamp this string onto the pendulum apparatus as shown in Figure 5.
Replace the word “material” on the spreadsheet with the type of material of the bob you’ve
chosen (see ﬁgure 10 for material types).
2. The length of the string from the pivot point to the center of mass of the bob () should
be somewhere between 0.4 and 1.2 meters. Measure this using the steel ruler provided and
record it on your template. Also weigh the bob and record its mass.
3. Use the same LoggerPro setup that you used in Experiment 1.
4. Set the photogate height so that the infrared light beam in the photogate is aligned with the
center of the bob at the bottom of the pendulum’s swing.
5. Record ﬁve successive periods of the pendulum’s oscillation. Copy and paste these into the
appropriate cells in your lab report.
6. Repeat steps 1-5 for ﬁve more different string lengths ranging from 0.4 to 1.2 meters. Try
to space your lengths equally over this interval. You will need to adjust the position of the
clamp holding the pendulum’s string so that the bob passes cleanly through the photogate in
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- Spring '11