Days 122-123: Interesting Test Work

Wednesday and Thursday, March 2 & 3 2016

Gave a test over forces today. Here are a few interesting things I uncovered:

#1: I asked kids to draw a free body diagram for a scenario given. No numbers, no working anything out, just drawing a free body diagram. In this scenario, a car is braking:

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This kid did some great work in realizing the brakes apply a force as well as friction which is always present. This kid also realized that because the car was slowing, there must be imbalance to the forces. But then this: Fthe car’s initial velocity. Oh no!

#2: Later, I regained some faith in my student body’s humanity when I spotted this drawing and explanation for a skydiver problem:

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