3 graphs - homework tonight: Just get the graphs complete (number axes properly, label, units, title) as homework tonight; we'll do analysis tomorrow during class. The graphs should be: Position - time (many people did this graph in class on Friday so it should look familiar), Position - t^2 (you will plot the x-axis as usual, going up to 25 s^2, and your data points will be plotted wherever they lie. They will get more and more spaced out, that's ok. Velocity - MidPoint Time will use the last two columns of your data table (again, this graph should look familiar - several groups plotted this on Friday with their wheel & axle data)
get a data table here
Also today:
Handed back lab journals (and more were turned in - grades will all be smoothed out tonight)
Discussion of how to act with a substitute teacher and Freeman's promise not to bore you next time - tougher work.
Speed vs. velocity notes (we did this in a T-chart)
Speed: how fast.... ........... uses distance ........................ speed = distance/time ... s = d/t
Velocity: speed & direction.... uses displacement (change in position)..... v=displacement/time v = (delta)x /t
Speed is always positive
Velocity may be + or -, depending on the frame of reference.
BOTH: share units: cm/s, m/s, mph, km/h and the two are often the same when describing motion.
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