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course Phy 201
Brief pendulum experimentUses: washer, thread, analog clock, ruler or meter stick
Construct a pendulum using washer and thread. Make 1-minute counts for pendulum lengths (measured from the position at which the thread is held to the center of the washer) equal to three different lengths:
* the the distance from your wrist to your fingertips
* the distance from your elbow to your fingertips
* the distance from your shoulder to your fingertips
Be sure to measure the length of each pendulum you time.
Report the pendulum lengths and the corresponding numbers of counts:
****
the distance from your wrist to your fingertips
7cm
68 full swings
the distance from your elbow to your fingertips
15.5cm
46 full swings
the distance from your shoulder to your fingertips
30cm
35 full swings
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It looks like your lengths were measured in inches rather than centimeters. Just multiply each by 2.54 and you'll get the equivalent length in cm.