Foot per second (ft/s) is a unit commonly used to measure velocity, particularly in the United States. It’s fascinating to note that this unit offers a unique perspective on speed, especially when compared to more universal units like meters per second. For instance, the speed of sound travels at approximately 1,125 feet per second, illustrating just how fast sound waves can move. Moreover, this unit is an essential part of the British Imperial and U.S. customary systems, embodying the historical evolution of measurement standards.
Interestingly, foot per second was also a critical measure in ancient construction and engineering, where precision in the rate of stone placement or water flow impacted architectural marvels. Today, it’s frequently applied in sports science to analyze athletic performances, such as a sprinter’s burst off the starting blocks or the flight speed of a baseball pitcher’s throw. This unit continues to bridge past engineering feats with modern technological applications, providing a unique linkage of history and contemporary science.
The knot, a unit of speed equal to one nautical mile per hour, has its origins in the age of sail. Mariners used a device known as the “common log” to measure a ship’s speed. This involved a wooden log attached to a rope with knots tied at uniform intervals. By counting the knots that passed through a sailor’s hands over a set period, they could determine the ship’s speed. Today, knots remain an essential measure in aviation and maritime contexts, underscoring how deeply it is embedded in navigation traditions.
Interestingly, the nautical mile, corresponding to one minute of latitude, is roughly 1.1508 miles. This makes the knot not only a unique unit for speed but also a reminder of the Earth’s curvature and ancient navigation skills.
Feet per second | Knots |
---|---|
0
ft/s
|
0
knot
|
1
ft/s
|
0.592484
knot
|
2
ft/s
|
1.18497
knot
|
3
ft/s
|
1.77745
knot
|
4
ft/s
|
2.36994
knot
|
5
ft/s
|
2.96242
knot
|
6
ft/s
|
3.5549
knot
|
7
ft/s
|
4.14739
knot
|
8
ft/s
|
4.73987
knot
|
9
ft/s
|
5.33235
knot
|
10
ft/s
|
5.92484
knot
|
11
ft/s
|
6.51732
knot
|
12
ft/s
|
7.10981
knot
|
13
ft/s
|
7.70229
knot
|
14
ft/s
|
8.29477
knot
|
15
ft/s
|
8.88726
knot
|
16
ft/s
|
9.47974
knot
|
17
ft/s
|
10.07223
knot
|
18
ft/s
|
10.66471
knot
|
19
ft/s
|
11.25719
knot
|
20
ft/s
|
11.84968
knot
|
21
ft/s
|
12.44216
knot
|
22
ft/s
|
13.03465
knot
|
23
ft/s
|
13.62713
knot
|
24
ft/s
|
14.21961
knot
|
25
ft/s
|
14.8121
knot
|
26
ft/s
|
15.40458
knot
|
27
ft/s
|
15.99706
knot
|
28
ft/s
|
16.58955
knot
|
29
ft/s
|
17.18203
knot
|
30
ft/s
|
17.77452
knot
|
31
ft/s
|
18.367
knot
|
32
ft/s
|
18.95948
knot
|
33
ft/s
|
19.55197
knot
|
34
ft/s
|
20.14445
knot
|
35
ft/s
|
20.73694
knot
|
36
ft/s
|
21.32942
knot
|
37
ft/s
|
21.9219
knot
|
38
ft/s
|
22.51439
knot
|
39
ft/s
|
23.10687
knot
|
40
ft/s
|
23.69935
knot
|
41
ft/s
|
24.29184
knot
|
42
ft/s
|
24.88432
knot
|
43
ft/s
|
25.47681
knot
|
44
ft/s
|
26.06929
knot
|
45
ft/s
|
26.66177
knot
|
46
ft/s
|
27.25426
knot
|
47
ft/s
|
27.84674
knot
|
48
ft/s
|
28.43923
knot
|
49
ft/s
|
29.03171
knot
|
50
ft/s
|
29.62419
knot
|
51
ft/s
|
30.21668
knot
|
52
ft/s
|
30.80916
knot
|
53
ft/s
|
31.40165
knot
|
54
ft/s
|
31.99413
knot
|
55
ft/s
|
32.58661
knot
|
56
ft/s
|
33.1791
knot
|
57
ft/s
|
33.77158
knot
|
58
ft/s
|
34.36406
knot
|
59
ft/s
|
34.95655
knot
|
60
ft/s
|
35.54903
knot
|
61
ft/s
|
36.14152
knot
|
62
ft/s
|
36.734
knot
|
63
ft/s
|
37.32648
knot
|
64
ft/s
|
37.91897
knot
|
65
ft/s
|
38.51145
knot
|
66
ft/s
|
39.10394
knot
|
67
ft/s
|
39.69642
knot
|
68
ft/s
|
40.2889
knot
|
69
ft/s
|
40.88139
knot
|
70
ft/s
|
41.47387
knot
|
71
ft/s
|
42.06636
knot
|
72
ft/s
|
42.65884
knot
|
73
ft/s
|
43.25132
knot
|
74
ft/s
|
43.84381
knot
|
75
ft/s
|
44.43629
knot
|
76
ft/s
|
45.02877
knot
|
77
ft/s
|
45.62126
knot
|
78
ft/s
|
46.21374
knot
|
79
ft/s
|
46.80623
knot
|
80
ft/s
|
47.39871
knot
|
81
ft/s
|
47.99119
knot
|
82
ft/s
|
48.58368
knot
|
83
ft/s
|
49.17616
knot
|
84
ft/s
|
49.76865
knot
|
85
ft/s
|
50.36113
knot
|
86
ft/s
|
50.95361
knot
|
87
ft/s
|
51.5461
knot
|
88
ft/s
|
52.13858
knot
|
89
ft/s
|
52.73106
knot
|
90
ft/s
|
53.32355
knot
|
91
ft/s
|
53.91603
knot
|
92
ft/s
|
54.50852
knot
|
93
ft/s
|
55.101
knot
|
94
ft/s
|
55.69348
knot
|
95
ft/s
|
56.28597
knot
|
96
ft/s
|
56.87845
knot
|
97
ft/s
|
57.47094
knot
|
98
ft/s
|
58.06342
knot
|
99
ft/s
|
58.6559
knot
|
100
ft/s
|
59.24839
knot
|
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