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I ask these students to predict what the data will look like. Most common prediction (by far): three lines, of three slopes: low, medium and high. Then I make them predict the slope of the lines. Most pick three random but ascending numbers. Then I let them compare their answers. I will say that though only maybe 1 in 10 students has picked three identically sloped lines, once the others see that prediction, it is quickly recognized as most likely. Then they do the experiment and of course all three lines have nearly the same slope, all in the 9.8 neighborhod.
On 09/29/2011 10:08 AM, Philip Keller wrote:
The point is that most of my students believe that heavier objects
fall faster even after they have "learned" otherwise.
Well, actually they generally do fall faster. They don't fall
as /much/ faster as students think they do, so there's still a
misconception here that we need to deal with ... but IMHO we
ought not overstate the case.