Day 101: Fnet=ma

Monday, 1 February 2016

These are the scariest fan carts I’ve ever seen — what with the exposed blades and extremely high speeds. Here are a few sample runs where the cart is steadily loaded down with more mass. Oh, and I realize that the force of friction increases as the weight of the carts increases. I didn’t want that but didn’t have a better solution. Here’s what the relationship between the mass and acceleration looked like for me:

Screen Shot 2016-02-01 at 8.57.08 PM

Kids were surprised at the leveling off of the graph. Great time to talk about human error! Oh and we also decided that rounding to three decimal places on such small numbers probably wasn’t a wise idea.

First time my kids have used motion detectors in my class. We also learned 3 Excel tips today: 1) you probably want the Scatter Plot chart type in physics, 2) applying the sorting filter thing to re-sort columns of data, and 3) the zoom option is probably more useful than changing the font size in a spreadsheet.


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