1. Consider the coffee mug demonstration performed in class https://youtu.be/JFl
ID: 1574288 • Letter: 1
Question
1. Consider the coffee mug demonstration performed in class
https://youtu.be/JFlEHjgrcFQ
What role do you think angular momentum played in saving the mug from destruction?
2. Consider a figure skater during a spin
https://www.youtube.com/watch?v=AQLtcEAG9v0
As she pulls her arms a legs in do you think each of the following quantities would increase, decrease or remain about the same. Explain your reasoning in each case.
Her angular velocity
Her moment of inertia
Her angular momentum
Her rotational kinetic energy
Explanation / Answer
2. I1w1=I2w2 conservation of angular momentum
angular velocity will increase
moment of inertia will decrease
angular momentum remains constant
RKE(rotational kinetic energy)= L2/2I as I decreases RKE increases
L= angular momentum
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