力是一种相互作用，当没有反对时，会改变对象的运动。它是在纽顿（N）中测量的。
1 N = 0.738 ft·lbf
1 ft·lbf = 1.356 N
例子:
将15 牛顿转换为脚击力：
15 N = 11.063 ft·lbf
| 牛顿 | 脚击力 |
|---|---|
| 0.01 N | 0.007 ft·lbf |
| 0.1 N | 0.074 ft·lbf |
| 1 N | 0.738 ft·lbf |
| 2 N | 1.475 ft·lbf |
| 3 N | 2.213 ft·lbf |
| 5 N | 3.688 ft·lbf |
| 10 N | 7.376 ft·lbf |
| 20 N | 14.751 ft·lbf |
| 30 N | 22.127 ft·lbf |
| 40 N | 29.502 ft·lbf |
| 50 N | 36.878 ft·lbf |
| 60 N | 44.254 ft·lbf |
| 70 N | 51.629 ft·lbf |
| 80 N | 59.005 ft·lbf |
| 90 N | 66.38 ft·lbf |
| 100 N | 73.756 ft·lbf |
| 250 N | 184.39 ft·lbf |
| 500 N | 368.781 ft·lbf |
| 750 N | 553.171 ft·lbf |
| 1000 N | 737.561 ft·lbf |
| 10000 N | 7,375.61 ft·lbf |
| 100000 N | 73,756.103 ft·lbf |
规则