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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:          ...