On Friday we worked with the air track (nearly frictionless) and experimented around with gliders to verify Newton's 2nd law, F = m * a
Today I went over homework problems, including the bonus (#3) and we found that astronauts in orbit around the Earth are experiencing about 90% the same gravitational field as we are. So the big question looms: WHY???!!!!??? do the videos of astronauts show them "floating" or appearing "weightless"????
If you can explain it (from your memory - not reading a printout from the Internet) tomorrow for class, you may receive some rare bonus points!
After the gravity problem/discussion we made motion maps using videos of last Friday's air track videos and verified that they were accelerating at different rates, almost exactly as F=ma predicts.
Homework (Due WED): p. 111 # 1-8
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