Pendulum Sample Lab

Topics: Pendulum, Angle, Conical pendulum Pages: 6 (1752 words) Published: December 13, 2012
.: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, making the pendulum slow in speed, causing the number of swings to be minimal. .Procedure:

1. I would first gather and set up my experiment.
2. I would have to do one washer before adding mass. I would make sure that I have constants, so I left the string at 50 cm. 3. Holding the washer at 90o, I would ask my partner to set the stopwatch/timer at 1 minute. When I starting the timer/stopwatch, I would let go of the pendulum and count how many full swings were made in 1 minute. 4. After the time is up, I would record the number of swings the pendulum made into a lab sheet that was provided. I would then finish the other two trials of 1 mass. 5. After finishing the first mass, I would repeat steps 3 through 4, changing only the mass of the pendulum. It would be 2 washers, 3 washers, etc...

.Data Table
Mass of the pendulum|
Mass of the Pendulum| Swings per minute|
| Trial 1| Trial 2| Trial 3| Average|
1| 40| 40| 40| 40|
2| 42| 41| 40| 40.33|
3| 38| 37| 40| 38.33|
4| 39| 40| 40| 39.66|
5| 40| 40| 37| 39|

.Results

.:Third experiment:.
.Problem: How will the angle of release affect the amount of swings in a minute? .Hypothesis: The angle of release will not affect the amount of swings made in a minute because you are letting the pendulum go at an angle where there is very hardly any friction, and there must be a least a certain amount of friction for the pendulum swing. .Procedure:

1. I would first have the gather and set up my materials. 2. I would have to keep something constant, so I would keep the string at 50 cm. I would also keep the mass constant, so I will only use one washer. 3. Holding the washer at 90o,I would ask my partner to set the timer at 1 minute. Then he would say go, and I will let go of the washer. I would count the amount of full swings made in one minute. 4. After time is up, I would then write my data into a lab sheet that was provided for me. I would then finish the...