PHYS 1408 Lab Homework- Rotational Dynamics This homework is due when you come t
ID: 2037728 • Letter: P
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PHYS 1408 Lab Homework- Rotational Dynamics This homework is due when you come to lab the week of April 9 Charles, Roscoe, and Buster are investigating rotational dynamics in their Physics Lab. Using the apparatus below, Buster places a disk with a mass of 425 g on the apparatus. Roscoe then hangs a 30 g mass from the pulley and releases it. The 30 g mass drops and then rises back up They each graph the angular velocity ? as a function of time for the drop and rise. Their graphs are shown below. Only one is correct. Identify the correct graph and explain why it is correct. (10 pts). For the incorrect graphs, explain why they are not correct. (two explanations at 10 pts each 20 pts for this portion; 30 pts total)Explanation / Answer
The second graph is correct. This is because as the mass goes down and rises up, the angular velocity will change direction. Also, initially its angular velocity will increase as the mass gets accelerated down due to gravity but gradually its acceleration will reduce and then turn to retardation and reduce the angular velocity to zero which corresponds to the lowest point of the mass where things come to rest momentarily. After this the system starts moving opposite to the inital direction.
First graph is wrong because it represents constant angular velocity after a certain time which means that the mass keeps going doen with constant velocity.
Third graph shows that angular velocity becomes zero after certain time which means the mass goes down and stops which is not true.
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