Unit of Momentum

In Newtonian mechanics, translational momentum, linear momentum, or simply momentum is the product of the mass and velocity of an object.  In reality, there is no specific name for the unit of momentum. This is because momentum is a product of mass and force and expressed in the units of these quantities. Besides, if we look at the formula of momentum it is given as;

SI Unit of Momentum

So, considering this condition, we will look at the possible units below.


SI unit kilogram meter per second (kg⋅m/s)
Common symbols p, p
Other units slug⋅ft/s
Dimension MLT−1

SI Unit of Momentum

As mentioned above, the units of momentum will be the product of the units of mass and velocity. Mass is measured in kg and velocity in ms-1, therefore, the SI unit of momentum will be kgm/s(-1).

Other Momentum Units

If we consider the situation when force is equivalent to the rate of change of momentum: i.e. Force=(change in momentum)/(time interval) then, change in momentum = Force * (time interval). Therefore, the unit for momentum can be Newton-second (Ns).

In the cgs system, if the mass is in grams and the velocity in centimetres per second, then the unit of momentum will be gram-centimetres per second (g⋅cm/s).

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