Day 104: Solving Energy Problems

2013-02-26 13.47.11

 

Today was the first day of solving problems with energy beyond energy bar charts (meaning, using K=1/2mv^2, etc). Anecdotally, I think that doing energy bar charts first qualitatively, plus starting energy empirically, has significantly increased students understanding of work and energy transfer. Thus problem solving today was a breeze. I should have some data on this in the future.

Another whiteboard below.

2013-02-26 13.46.55

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3 Comments on “Day 104: Solving Energy Problems”

  1. Kelly O'Shea says:

    They are leaving the system blank…!

    • I am not a detail person, thus one of my current weaknesses is modeling and forcing these kinds of details. Another example is always using by-on notation for Forces on free body diagrams. Also, with the grading scheme that I have to use for this class, there is no grade based motivation for those details either. It’s definitely something I have to work on.

      • Kelly O'Shea says:

        The details in the diagrams can make a huge difference. There are a lot of layers to understanding energy that aren’t obvious right away for students, and a lot of that is tied up in system choice. A lot of the time it comes down to making sure you are always completing the details when you draw any diagram (they do what you do). But the system is pretty key. I wouldn’t qualify it as a detail. It’s the main event in an LOL.

        I don’t ever use by-on notation in FBDs. That seems excessive.


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