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MOMENTUM, LAW OF CONSERVATION OF MOMENTUM

MOMENTUM:Linear momentum of a moving body is equal to the product of its mass and velocity. It is denoted by It describes the quantity of motion contained in a body and how easy or difficult to stop a moving body.
If a body of mass m moves with velocity then its linear momentum is given by As the velocity is a vector quantity, therefore, linear momentum is also vector quantity and its direction is same as that of velocity.
Units:
            In S.I system its units are Kg m/s or Ns
Momentum and Newton’s Second Law of Motion:


IMPULSE:
When a large force acts upon a body for a very short interval of time and for this interval the product x ∆t  is called impulse.
Thus product of force and time for which force acts is called impulse of the force Impulse = F x ∆t
Impulse is a vector quantity, having same direction as that of force .
Units:
            The unit of impulse is Ns and its dimension is same as that of momentum
LAW OF CONSERVATION OF MOMENTUM
            It states “In the absence of an external force, the total linear momentum of an isolated system remains conserved.      
OR
Total linear momentum of an isolated system remains constant

i.e. initial momentum of the system before collision  =  Final momentum of the system after collision.
            It means that total momentum of isolated system before and after collision remains constant..
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