IMG_20130307_141642115 The conceptual classes have been doing a pretty good job measuring and calculating, and releasing their ball bearings from the same height on a ramp every time. Some groups are really close to the red line!



Practicum Set-up

IMG_20130304_151816112 I’ve been setting up the projectile practicum. Hit the target, after placing it on the floor! I’m providing a selection of two sizes of ball bearings for students to choose from.IMG_20130304_151919



20130104-130620.jpg74 My 5th period class had some great results from their practicum with the coffee filters. One group got a time only 0.04 seconds off their “given” time, and another group (shown above) got only 0.01 second off their “given” time! Wow!


Coffee Filters

20130102-131014.jpg72 Starting off the new year with a lab. This is a coffee filter drop lab, in which students model the motion of a coffee filter from data they take in class, then they predict how high they would have to drop it from in order for the filter to take a given amount of time to hit the floor. The tricky bit is the room is less than 3 meters tall, and invariably they calculate a height greater than 3 meters (I’m sneaky about how I pick the “given” times). We have to go out to one of the stairwells to test the prediction. A good model results in a drop time within 0.1 s of the given time.




66 Today some conceptual students did their first “practicum.” They timed how long it took the slow-acceleration disk to roll one meter down its ramp. Then they had to determine how fast it had been going when it passed the 1-m mark. While they timed it, I took video. While they debated how to find the answer, I did video analysis. They told me the answer was 0.16 m/s and then Tracker told me the answer was 0.164 m/s. So I told them that they got it right. They were a little stunned, I think, and I hope they were also proud of themselves for doing it. Next step: more complicated questions.