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10 cards from this deck
Control for sagging & thermal expansion
1 kg mass to make wires taut
1 kg at a time up to ~8 kg
Twice more (3 times total)
A=πd24A = \frac{\pi d^2}{4}A=4πd2
F=mgF = mgF=mg where g≈9.81 m/s2g \approx 9.81 \text{ m/s}^2g≈9.81 m/s2
Force (y-axis) vs Extension (x-axis)
E=l×GAE = \frac{l \times G}{A}E=Al×G
Safety goggles
Minimise errors & reduce % uncertainty in length
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