The newton-second (also newton second; symbol: N⋅s or N s) is the unit of impulse in the International System of Units (SI). 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. Definition Momentum is given by the formula: is the momentum in newton-seconds (N⋅s) or "kilogram-metres per second" (kg⋅m/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 Classical mechanics SI derived units Units of measurement