Momentum and energy
With a heavy head cold draining energy, the silent opening was easy to maintain. Once the diagrams were up on the board, a brief description of the exploration was given.
The right side was after what was a good 20 minutes of exploration, perhaps more.
Iva Faye records data while Leila'Ona watches. Maylanica is setting up to time a run from around 5 or 8 cm up the ramp. Heights were the Fibonacci sequence from 5 cm and up.
Based on the Hot Wheels cars and track producing very linear data, this term saw a return to banana leaf marble ramps. The leaves were gathered in the morning. The absence of carpenter ants, a recent development, and of scale insects, made cutting and carrying a much more pleasant activity. And the leaves are healthier and stronger.
In the background the theory is up on the board. This term the rotational kinetic energy was not included. In a change from past practice, the theory was covered up front and the students were to test whether the theory was supported by their data. A critical omission was showing the students the shape of y=√x in Desmos. Foggy brain due to a head cold caused this oversight. When the students obtained a square root curve, they did not recognize the shape as being a square root relationship. Perhaps v=44.27√h would be an even better graph to display on the Smartboard.
KE = GPE
½mv² = mgh
½v² = gh
v² = 2gh
v = √(2gh)
v = √(2g)√(h)
if g is 980 cm/s² then
v ~ 44.27√h
Maylanica timing
The banana leaves were set up on the west end of the tables to use the sinks as backstops.
Jenry-Thor and Camridge set up their leaf
Measuring the speed trap
Elain recording data
Board notes
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