Asked if there were any demos for rotational inertia.
TW brought in different diameter jars. He was going to fill them with equal masses of water and see which rolled faster down a ramp. I asked if he had tried racing them without water and he said the speeds were pretty much the same.
To test this we tried racing pennies and quarters. Didn't work well since they kept falling over. Used u-tack to stick 4 of each together and raced them. Not completely clear, but they were pretty close.
Started Hewitt video on Gravity.
Stopped for:
a. discussion of "Universal" and how it changed the world view
b. Did several examples using Newton's Law for finding the force with varying masses and distances. Showed how to do the substitution math.
c. How different dimension worlds would affect the Intensity vs distance relationship
d. Students calculated G*Me/Re^2
Postponed HW (Kepler's Law worksheet) until tomorrow.
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