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The SI unit of force and how to picture it.
One newton is the force needed to accelerate a 1 kg mass at 1 m/s² — roughly the weight of a small apple in your hand. Everyday forces are therefore hundreds or thousands of newtons: a 70 kg person weighs about 686 N on Earth.
One pound-force (lbf) ≈ 4.448 N. One kilogram-force (kgf, the weight of 1 kg under standard gravity) = 9.80665 N. These are fixed conversions.
| N | lbf | kgf |
|---|---|---|
| 1 | 0.225 | 0.102 |
| 10 | 2.248 | 1.020 |
| 100 | 22.48 | 10.20 |
It's a force. Weight is the force of gravity on a mass, so you can express weight in newtons. A 1 kg mass weighs about 9.81 N on Earth.
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