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Pendulum Sample Lab

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Pendulum Sample Lab
.:First experiment:.
.Problem: How will the length of a pendulum affect the amount of swings per minute?
.Hypothesis: I believe that the length of the pendulum will affect the amount of swings per minute because when the string is shorter in length, there would be less friction between the string and the atmosphere, causing the string to go faster.
.Materials:
* String ( should be 70-90 cm long) * Metal washers * Stopwatch * Metric ruler * Stand * Extra washers (You will need 4 for the second experiment.) * Protractor (This will be used for the third experiment.)
.Procedure:
* I would gather all of the materials first. * Tying one counter onto the string, I would then let the string hang from the end of the table with 50 cm of string not rolled up on the stand. * Holding the pendulum by the washer at 90o, I would ask my partner to set the timer or stopwatch at 1 minute. As soon as my partner starts the stopwatch/timer, I would release the pendulum. * I would then count how many times the pendulum swung. The swing will only be valid if it makes a full semi-circle, meaning from right to left then back to right. * After one minute is up, I would then record my data into the lab sheet I was provided. After finishing one trial, I would do the same for the other two trials for 50 cm. * After finishing 50 cm three times, I would then repeat steps 3 through 5, changing the lengths into 40, 30, 20, and 10.
.Data Table Length of the pendulum | Length of string (cm) | Swings per minute | | Trial 1 | Trial 2 | Trial 3 | Average | 10 | 82 | 82 | 77 | 80.33 | 20 | 63 | 63 | 62 | 62.66 | 30 | 52 | 53 | 56 | 53.66 | 40 | 45 | 45 | 45 | 45 | 50 | 40 | 40 | 40 | 40 |

.Results

.:Second experiment:.
.Problem: How will the mass of a pendulum affect the amount of swings in a minute?
.Hypothesis: The mass of a pendulum would not affect the swings per minute because the mass would cause more friction,

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