video clips 2230 dice on rotating strap 2231 same from above, but collides with m stick 2232 from above, good run, speaking not audible 2233 clock timer superball clock hard to see with glare (bad bounce on 2d set) 2234 computer clock pendulum how accurate is each (glare on clock but second hand is in visible region), timing ball down ramp 2235 same with dollar coin, bad run 2236 with dollar coin; can we detect diff in time down ramp 2237 with three dollar coins ... bad run 2238 with three coins, can't hear speech but should be clear 2239 dollar coin at high end, can we tell difference now? 2240 clock, TIMER, pendulum what can we tell about how pend changes position, and how it changes velocity 2241 add half N at time, meter stick, low-k spring; does length change by same amt for every half Newton? 2242 see spring oscillating with about 1.5 N wt (timer lost) 2243 adding half-Newton weights, better explanation, smoother than 2241 2244 oscillating with about 1.5 N weight; take half N off, get oscillation, take of another .5 N; was spring oscillating at same rate both times? 2246 weight hanger, low-coefficient spring oscillations with computer timer and clock "at what rate is position changing ... how quickly is it speeding up?" 2247 same with additional half newton wt (top of motion cut off) 2248 same as 2246 but timer in front, hanger goes off top of screen; good question to add is "where is it moving fastest" 2249 adding 1/2 N at a time with meter stick "by how much does the length of the rubber band chain change with the addition of each half-Newton weight? note: clock and board are in focus, meter stick might be blurry 2250 system oscillates with different frequency as we remove masses 2251 release hanger from eq position of systems of various mass (masses removed) and see how fast and high the hanger goes 2252 two ramps, lip, clearly a quick change in speed at the lip (meter stick too low to see) 2253 similar with timer, meter stick still not visible 2254 at what rate is pos changing and how quickly is vel changing on each ramp, and is there a difference in how quickly vel changes (meter stick still too low; zoomed back) 2255 screw mechanisms; focus on mechanism in forefront, blurry system; quarter-turn 2256 aborted 2257 meter stick now high enough; good run, no speaking 2258 probably speaking but can't hear; good run but domino at lower end not set up 2259 audible, good run, ramps nearly even; does vel change more or less quickly on 2d ramp than on 1st 2260 simple run one ramp, screw mech support, no domino at end 2261 same with domino at end, then with (quarter)-turn; does vel change at same rate, what is ave vel 2262 - (dog in creek, unmovable stick)