(Redirected from Newton second)
| Newton-second | |
|---|---|
For two objects moving with the same velocity (v), the object with the greater mass (m) will have the greater momentum (p). | |
| General information | |
| Unit system | SI derived unit |
| Unit of | Impulse and momentum |
| Symbol | N⋅s or N s |
| Named after | Isaac Newton |
| In SI base units: | kg⋅m/s |
The newton-second (also newton second; symbol: N⋅s or N s)[1] is the derived SI unit of impulse. It is dimensionally equivalent to the momentum unit kilogram-metre per second (kg⋅m/s). 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.
Momentum is given by the formula:
This table gives the magnitudes of some momenta for various masses and speeds.
| Mass (kg) |
Speed (m/s) |
Momentum (N⋅s) |
Explanation |
|---|---|---|---|
| 0.42 | 2.4 | 1 | A 420-gram (15 oz) football (FIFA specified weight for outdoor size 5) kicked to a speed of 8.6 km/h (5.3 mph). |
| 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 137 km/h (85 mph), making it one of the hardest kicks measured. |
| 1300 | 10 | 13000 | A four-door car weighing 1300 kg (2900 lb) crashing at 36 km/h (22 mph). |
| 2000 | 10 | 20000 | A mid-size SUV weighing 2000 kg (4400 lb) crashing at 36 km/h (22 mph). |
| 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. |
| 2030000 | 8050 | 1.63×1010 | Space Shuttle launched from earth to orbit |
| 45702 | 10834 | 4.95×108 | Apollo 11 launched from earth to orbit |
| 0.0075 | 350 | 2.6 | A 7.5-gram (0.26 oz) handgun bullet (e.g. 9mm Parabellum) fired at 350 m/s (1100 ft/s). |
| 0.004 | 945 | 3.8 | A 4-gram (0.14 oz) assault rifle bullet (e.g. 5.56×45mm NATO) fired at 945 m/s (3100 ft/s). |
| 0.05 | 860 | 43 | A 50-gram (1.8 oz) anti-material bullet (e.g. .50 BMG) fired at 860 m/s (2800 ft/s). |
