Unfortunately, we could do only one quiz question today, but that is alright. I think there is a lot to discuss for this one [classic] question. Please feel free to work out and discuss your answer to this question as much as you like.
This question is what I would call an "inverse roller coaster loop" question, but the idea remains the same -- the normal force and the energy conservation. So, you can discuss the roles of these two to determine when the bug will leave the head. [The answer is when the bug is down by r/3 in terms of height.] I went kind of too fast at the end of today's lecture and it may be that a lot of people did not get the details of the solution.
If you are really curious, you can also set up Newton's equation for this problem, and appreciate why that equation would be impossible to solve on paper.
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