Name: Qiwen Ye (Sherry)
Lab partners names: Jae Yoo, Chandler
Date: 03-Oct-2016
2. Purpose
In this lab, we studied the rotation motion in order to find the relationship between the angle theta and the angular velocity.
3. Introduction
When an object is rotating like the picture shown, it will provide an angle theta. In order to find the angle theta, we need to measure the length of string, the height from the top to the ground.
We used an electric motor mounted on a surveying tripod and put the long shaft vertically up from the shaft. The horizontal rod mounted on the vertical rod. A long string tied to the end of the horizontal rod. A rubber stopper at the end of the string. A ring stand with a horizontal piece of paper or tape sticking out.
5. Measured Data
We got the relationship between angle theta and angular velocity.
After that, we did the same experiments in different period (T), that we can get the angular velocity by the equation w=2pie/T (Note: T is in 10 rotation). Also, we measured the height h in order to get the angle theta between the rotation center and the string.
6. Conclusion
In this experiment, we found that when the angle theta increase, the angular velocity will get bigger. The different percent of angular velocity is between 2.33-8.58%. The reason cause the different is the friction of the apparatus while using the that make a rotation. And, the friction between the string and the rotation point. The air-resistance may also cause the different when the object is rotating.
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