Linear momentum is defined as a product of mass of an object and its velocity. It's a vector quantity. Any change in mass or the velocity of the system causes change in linear momentum.
Find impulsive force using impulse momentum relation
Example: A particle of mass 2 kg moving with a velocity of 3 m/s is acted upon by a force which changes its direction of motion by an angle of 90o without changing its speed. What is the magnitude of impulse experienced by the particle?
Solution: Initial velocity of the particle v1=3i^m/s Final velocity of the particle v2=3j^m/s Change in momentum ΔP=m(v2−v1)=2×3(j^−i^) ∣ΔP∣=2×32=62 N s Magnitude of impulse I=∣ΔP∣=62 N-s
Unit and formula for momentum
Momentum is a product of mass and velocity.It is denoted as p. Momentum has both direction and magnitude. It is a vector quantity. Its direction is same as that of the velocity. p=mv Unit of momentum is kgm/s or Ns