Wednesday, May 9, 2007
Les. 1 Continued
So, the rest of my classes did not comment at all on the blue car slowing down. That seems to be in issue with one class only. But.... there is a consistent mistake on a graph representation. The kids are saying that the blue car is moving at a constant rate and so they are graphing it as a linear line, actually showing the car speeding up as time goes on at a constant rate. The graph is a speed/time graph, but they show the blue car increasing in speed even though they say differently. I am asking them about that, but they are not catching it so at the end of the presentations I will bring that to their attention. I would say this occurs with at least 5 of 7 groups. This really does take
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It's ok for students to make some of these mistakes (confusing position-time and speed-time graphs) in their elicitation presentations. They are only sharing their ideas; this is an opportunity for us to get a sense of what they're thinking and the types of mistakes they're making. This confusion is super common and will not likely be "fixed" by any one experience or conversation, but a series of experiences.
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