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Rev. Notes > IGCSE > Momentum
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Basic Concept of Momentum

Basic Concept of Impulse

Momentum Equation, P = mv

Equation For Impulse, Ft = mv – mu

Law of Conservation of Momentum


Basic Concept of Momentum

It determins the quantity of motion in a body.

It is defined as the "mass of the body multiplied by its velocity".

It is measured in kilogram metre per second (kgm/s) or newton second (Ns).

Momentum = mass X velocity

P = m  v

As velocity is a vector quantity, so momentum is a vector quantity too. We must give a direction when we talk about momentum. 

Momentum is very useful when we meet problems involving collisions or explosions. There is always as much momentum after a collision as there is before it (Principle of conservation of momentum).


  • It is clear from the formula that momentum of the body is zero if it is at rest.


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View Comments on this Chapter - Total Comments (3)
Ahmed Zaki Said :
I think there might be a mistake in the description of momentum - it says in the notes that the unit of momentum is kg m/s or Newton seconds. In a different page about impulse, it says impulse is measured in the unit Newton seconds. Which of them is right? PS. Thank you for the clear and easy notes on this topic :)
  13/11/15 02:57 PM
haris haseeb Said :

quite easy chapter
Admin Replied: Yes, simple concepts

  13/09/15 06:11 PM
Ainan Said :

Great to see the notes on momentum

  10/09/15 11:01 AM


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