Newton-second
The newton-second is the derived SI unit of impulse. It is dimensionally equivalent to the momentum unit kilogram-metre per second. One newton-second corresponds to a one-newton force applied for one second.
It can be used to identify the resultant velocity of a mass if a force accelerates the mass for a specific time interval.
Definition
Momentum is given by the formula:- is the momentum in newton-second or "kilogram-metres per second"
- is the mass in kilogram
- is the velocity in metres per second
Examples
| Mass | Speed | Momentum | Explanation |
| 0.42 | 2.4 | 1 | A football kicked to a speed of. |
| 0.42 | 38 | 16 | The momentum of the famous football kick of the Brazilian player Roberto Carlos in the match against France in 1997. The football had a speed of, making it one of the hardest kicks measured. |
| 10 | A four-door car weighing crashing at. | ||
| 10 | A mid-size SUV weighing crashing at. | ||
| 6 | 1 | 6 | The total impulse of a class C model rocket engine, which can be found in amateur fireworks. |
| 10 | 2 | 20 | The total impulse of a class D model rocket engine, which also can be found in amateur fireworks. |
| Space Shuttle launched from earth to orbit | |||
| Apollo 11 launched from earth to orbit | |||
| 0.0075 | 350 | 2.6 | A handgun bullet fired at. |
| 0.004 | 945 | 3.8 | A assault rifle bullet fired at. |
| 0.05 | 860 | 43 | A machine gun bullet fired at. |