Day 94: A few more circular motion Force Diagram Demo’s

Advanced Physics:

As I mentioned yesterday, I had a few more ways to recreate the circular motion force diagrams the students were drawing.  But first, here is the clip of the race track showing a banked corner vs. an unbanked corner.

Here is another of the situations the students drew a force diagram for:  (according my students, the drawing is a bit hard to interpret)

Screen Shot 2015-01-28 at 7.26.35 PM


I know that it might be a bit of a stretch to have a vertical circle at constant velocity with a rope, but it simplified the FD for the students. Here we are re-creating it:

Here is the last one.

Screen Shot 2015-01-28 at 7.45.57 PM


The discussion involved us getting to the point of recognizing that the tension force is not constant.  As part of the discussion, I asked the kids to sketch the tension force as a function of time graph. To check that, as well as the force diagram, we swung a Vernier WDSS in a vertical circle while capturing the video.  Really nice once the two are synched… you can see that when the sensor is at the top of the circle, the tension force is the smallest.  Unfortunately, I did not save the ones from class, but here is my practice:


General Physics:

Yep, I’m still teaching this course too.  There is not much exciting to post because much of what we are doing now, I have already written about with the Advanced class.


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