The newton-second (also newton second; symbol: Ns or Ns) is the unit of impulse in the International System of Units (SI). It is dimensionally equivalent to the momentum unit kilogram-metre per second (kgm/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.

Definition

Momentum is given by the formula:

• is the momentum in newton-seconds (Ns) or "kilogram-metres per second" (kgm/s)

• is the mass in kilograms (kg)

• is the velocity in metres per second (m/s)

Examples

This table gives the magnitudes of some momenta for various masses and speeds.

See also

• Power factor

• Newton-metre – SI unit of torque

• Orders of magnitude (momentum) – examples of momenta

References