Pound-force is a fascinating unit that merges the concept of mass and gravity, rooted deeply in the imperial system. It represents the force exerted by gravity on a one-pound object at the Earth’s surface. Interestingly, the distinction between pound-force and pound-mass became vital as precision in science and engineering increased, leading to the creation of a standard gravitational constant. Unlike the pound used for weight, pound-force considers the acceleration due to gravity, approximately 32.174 ft/s², offering a glimpse into how we measure force beyond just mass.
In practical terms, the concept of pound-force is woven into everyday life, particularly in the United States, where the imperial system is prevalent. For example, when you hear that a tire is inflated to 30 psi (pounds per square inch), those “pounds” refer to pound-force. Understanding this unit gives an insight into how force impacts our daily mechanics, from vehicle dynamics to the tension in a bridge cable, illustrating the omnipresence of physics in our bustling world.
The kilogram-force (kgf) is a fascinating unit of force that originates from the gravitational pull exerted on a mass of one kilogram at Earth’s surface. Though it’s not a part of the International System of Units, it has historical significance in fields such as engineering and physics. One kilogram-force is equivalent to approximately 9.80665 newtons, reflecting the acceleration due to Earth’s gravity at sea level.
Interestingly, the concept of kilogram-force harkens back to times when engineers needed a more intuitive way to express force without delving into the complexities of the then-emerging newtons. Its use has diminished with the universal adoption of newtons, but it still appears in various legacy systems and specific applications, especially in countries that historically avoided metrication.
Pound-forces | Kilogram-forces |
---|---|
0
lbf
|
0
kgf
|
10
lbf
|
4.53576
kgf
|
20
lbf
|
9.07152
kgf
|
30
lbf
|
13.60728
kgf
|
40
lbf
|
18.14304
kgf
|
50
lbf
|
22.6788
kgf
|
60
lbf
|
27.21456
kgf
|
70
lbf
|
31.75032
kgf
|
80
lbf
|
36.28608
kgf
|
90
lbf
|
40.82184
kgf
|
100
lbf
|
45.3576
kgf
|
110
lbf
|
49.89336
kgf
|
120
lbf
|
54.42912
kgf
|
130
lbf
|
58.96488
kgf
|
140
lbf
|
63.50064
kgf
|
150
lbf
|
68.0364
kgf
|
160
lbf
|
72.57216
kgf
|
170
lbf
|
77.10792
kgf
|
180
lbf
|
81.64368
kgf
|
190
lbf
|
86.17944
kgf
|
200
lbf
|
90.7152
kgf
|
210
lbf
|
95.25096
kgf
|
220
lbf
|
99.78672
kgf
|
230
lbf
|
104.32248
kgf
|
240
lbf
|
108.85824
kgf
|
250
lbf
|
113.394
kgf
|
260
lbf
|
117.92976
kgf
|
270
lbf
|
122.46552
kgf
|
280
lbf
|
127.00128
kgf
|
290
lbf
|
131.53704
kgf
|
300
lbf
|
136.07281
kgf
|
310
lbf
|
140.60857
kgf
|
320
lbf
|
145.14433
kgf
|
330
lbf
|
149.68009
kgf
|
340
lbf
|
154.21585
kgf
|
350
lbf
|
158.75161
kgf
|
360
lbf
|
163.28737
kgf
|
370
lbf
|
167.82313
kgf
|
380
lbf
|
172.35889
kgf
|
390
lbf
|
176.89465
kgf
|
400
lbf
|
181.43041
kgf
|
410
lbf
|
185.96617
kgf
|
420
lbf
|
190.50193
kgf
|
430
lbf
|
195.03769
kgf
|
440
lbf
|
199.57345
kgf
|
450
lbf
|
204.10921
kgf
|
460
lbf
|
208.64497
kgf
|
470
lbf
|
213.18073
kgf
|
480
lbf
|
217.71649
kgf
|
490
lbf
|
222.25225
kgf
|
500
lbf
|
226.78801
kgf
|
510
lbf
|
231.32377
kgf
|
520
lbf
|
235.85953
kgf
|
530
lbf
|
240.39529
kgf
|
540
lbf
|
244.93105
kgf
|
550
lbf
|
249.46681
kgf
|
560
lbf
|
254.00257
kgf
|
570
lbf
|
258.53833
kgf
|
580
lbf
|
263.07409
kgf
|
590
lbf
|
267.60985
kgf
|
600
lbf
|
272.14561
kgf
|
610
lbf
|
276.68137
kgf
|
620
lbf
|
281.21713
kgf
|
630
lbf
|
285.75289
kgf
|
640
lbf
|
290.28865
kgf
|
650
lbf
|
294.82441
kgf
|
660
lbf
|
299.36017
kgf
|
670
lbf
|
303.89593
kgf
|
680
lbf
|
308.43169
kgf
|
690
lbf
|
312.96745
kgf
|
700
lbf
|
317.50321
kgf
|
710
lbf
|
322.03897
kgf
|
720
lbf
|
326.57473
kgf
|
730
lbf
|
331.11049
kgf
|
740
lbf
|
335.64625
kgf
|
750
lbf
|
340.18201
kgf
|
760
lbf
|
344.71777
kgf
|
770
lbf
|
349.25353
kgf
|
780
lbf
|
353.78929
kgf
|
790
lbf
|
358.32505
kgf
|
800
lbf
|
362.86081
kgf
|
810
lbf
|
367.39657
kgf
|
820
lbf
|
371.93233
kgf
|
830
lbf
|
376.46809
kgf
|
840
lbf
|
381.00385
kgf
|
850
lbf
|
385.53961
kgf
|
860
lbf
|
390.07537
kgf
|
870
lbf
|
394.61113
kgf
|
880
lbf
|
399.1469
kgf
|
890
lbf
|
403.68266
kgf
|
900
lbf
|
408.21842
kgf
|
910
lbf
|
412.75418
kgf
|
920
lbf
|
417.28994
kgf
|
930
lbf
|
421.8257
kgf
|
940
lbf
|
426.36146
kgf
|
950
lbf
|
430.89722
kgf
|
960
lbf
|
435.43298
kgf
|
970
lbf
|
439.96874
kgf
|
980
lbf
|
444.5045
kgf
|
990
lbf
|
449.04026
kgf
|
1000
lbf
|
453.57602
kgf
|
Conversion | Call to Action |
---|---|
Pound-forces to Newtons | Go to converter |
Pound-forces to Kilonewtons | Go to converter |
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