158-M9 Manual Addendum rev 1

158-M9 Manual Addendum rev 1 - 158-M9 Harmonic Motion...

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158-M9 Harmonic Motion Manual Addendum V: Procedure V-1: No changes to lab manual. V-2: Proceed as directed in the lab manual, but be aware that there is a right and wrong way to hang the spring. With your spring hanging, and no mass or mass holder attached, each loop in the spring ought to be roughly equidistant from its neighbors. This means that the smaller diameter end should be at the top, and the larger diameter end should be at the bottom. V-3: Next, we will take the data to verify equation 7. Rather than using a stopwatch, we will use the Pasco counter/timer to count the number of oscillations in a fixed period of time. In this instance, the counter/timer will tell us how many cycles, or oscillations occurred in 60 seconds. The way it works is as follows: The counter/timer has a photogate plugged into the back of it. The photogate consists of a light source, and a light detector. The counter/timer will count how many times the light beam to the light detector gets interrupted. Start with a 50 gram mass on the mass holder at the end of the spring. Place the short end of the Aluminum flag between the mass and the mass holder-the 50 gram mass will hold it in place. With the mass at rest, adjust the height of the photogate such that the flag is centered in the light beam. See the figure for section V-3 in the TA presentation. Set the controls on the counter/timer as directed on the data tables. Now, set the mass into oscillation by pushing it straight down about 3 cm. Let go of the mass and make sure that the flag is going only up and down (not side to side) and that it clears the photogate light beam on the top and the bottom of each cycle. Now start the counter/timer. The counter/timer will tell us how many times the beam was interrupted, which happens twice per cycle. You will repeat this procedure twice (for a total of three trials), and then you will increase the
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158-M9 Manual Addendum rev 1 - 158-M9 Harmonic Motion...

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