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 newton seconds |
Explanation |
---|---|---|---|
0.42 | 2.4 | 1 | A 420 gram football (FIFA specified weight for outdoor size 5) kicked to a speed of 8.6 km/h. |
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, making it one of the hardest kicks measured. |
1,500 | 16.7 | 25,050 | A regular small car weighing 1.5 tons crashing at 60 km/h |
2,600 | 16.7 | 43,420 | An SUV weighing 2.6 tons crashing at 60 km/h |
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. |
2,030,000 | 8050 | 1.63x10^{10} | Space Shuttle launched from earth to orbit |
45,702 | 10834 | 4.95x10^{8} | Apollo 11 launched from earth to orbit |
0.0075 | 350 | 2.6 | 9x19 mm 7.5 gram pistol round launched at 350 m/s |
0.004 | 945 | 3.8 | 5.56 mm (.223) 4 gram rifle round launched at 945 m/s |
0.05 | 860 | 43 | 12.7x99 mm (.50 BMG) 50 gram rifle round launched at 860 m/s |
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