Reaction Time Ruler Test

Here is a simple reaction time test using only a ruler, and a little bit of calculating. This is a good science class project. This test uses the known properties of gravity to determine how long it takes a person to respond to the dropping of an object by measuring how far the object can falls before being caught. An even simpler test, a variation of this test but not involving any calculations, requires making your own Reaction Timer. There are some commercially available variations of this test - see this review of Reaction Sticks.

t = sqrt ( 2d / g )

distance (cm) time (seconds) distance time distance time distance time
1 0.045 26 0.230 51 0.323 76 0.394
2 0.064 27 0.235 52 0.326 77 0.396
3 0.078 28 0.239 53 0.329 78 0.399
4 0.090 29 0.243 54 0.332 79 0.402
5 0.101 30 0.247 55 0.335 80 0.404
6 0.111 31 0.252 56 0.338 81 0.407
7 0.120 32 0.256 57 0.341 82 0.409
8 0.128 33 0.260 58 0.344 83 0.412
9 0.136 34 0.263 59 0.347 84 0.414
10 0.143 35 0.267 60 0.350 85 0.416
11 0.150 36 0.271 61 0.353 86 0.419
12 0.156 37 0.275 62 0.356 87 0.421
13 0.163 38 0.278 63 0.359 88 0.424
14 0.169 39 0.282 64 0.361 89 0.426
15 0.175 40 0.286 65 0.364 90 0.429
16 0.181 41 0.289 66 0.367 91 0.431
17 0.186 42 0.293 67 0.370 92 0.433
18 0.192 43 0.296 68 0.373 93 0.436
19 0.197 44 0.300 69 0.375 94 0.438
20 0.202 45 0.303 70 0.378 95 0.440
21 0.207 46 0.306 71 0.381 96 0.443
22 0.212 47 0.310 72 0.383 97 0.445
23 0.217 48 0.313 73 0.386 98 0.447
24 0.221 49 0.316 74 0.389 99 0.449
25 0.226 50 0.319 75 0.391 100 0.452

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