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13 cards from this deck
Trolley with ticker timer & air track with timing gates
uuu, vvv (velocities), aaa (acceleration), ttt (time)
50 Hz (50 dots per second)
rac{1}{50} second
u = rac{s_1}{n/50}
a = rac{v-u}{t}
u = rac{l}{t_1} where lll = card length
a = rac{v^2 - u^2}{2s}
Spaces between dots get progressively larger
Remove dirt/grit that causes velocity variations
Adjust levelling screws until rider moves smoothly
Friction causes velocity variations
Card must be parallel to direction of motion
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