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Note to self about possible standard change…

June 11, 2012

Week one standards this summer were the following:

#1: I can re-express quantities using different units

#2: I can distinguish among position, distance and displacement

#3: I can relate an object’s acceleration to how its velocity changes

#4: I understand the direction and signing conventions for acceleration during free-fall

Next time, I want something more like:  I can distinguish between average velocity from change in velocity. 

There are just too many times that we are thinking through problems by considering these kinds of quantities

1/2 (Δv) (Δt)

Vavg (Δt)

Δv/Δt

Δx/Δt

The reason I am saying this is because on our first exam, much of the feedback I gave out was about the distinction.

 

 

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4 Comments leave one →
  1. June 12, 2012 1:07 am

    Are you thinking of adding a 5th standard or replacing one of the existing ones?

    • June 12, 2012 1:12 am

      I’ve been having that conversation with myself. Leaning toward replace… but with maybe trying to roll #3 and #4 together… but I’m not sure. The only way I would add on is if I was committed to spending another day on kinematics stuff… which I have also separately thought about. Students did really well with #3, especially after we do the invention activities from Andrew Boudreaux and company. #4 was the hardest.

      • June 12, 2012 4:47 am

        That’s really interesting. My gut reaction was that #4 was the one that was probably not needed. As usual, if you want to know how a novice things, you need to ask an actual novice.

    • June 12, 2012 4:48 am

      err…thinks, not things

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