Class 11 Physics Laws of Motion Momentum


Newton’s first law was for scenarios where net force = 0. The second law is for scenarios with net force not equal to 0. Momentum plays a crucial role in Second law.

  • Momentum is the product of mass of a body & its velocity
  • It is a Vector quantity
  • It is denoted by p = mv

For example, A ball of 1 kg moving with 10m/sec has a momentum 10kg m/sec.

Momentum of a system remains conserved. Therefore,

  • Greater force is required to set heavier bodies in motion


  • Greater force is required to stop bodies moving with higher velocities

Conclusion: Greater the change in momentum in a given time, greater is the force that needs to be applied. In other words, greater the change in momentum vector, greater is the force applied.

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