Hence, 'Force equals rate of change of momentum' is an alternate form of the second law.

Further,
Therefore, 'Impulse of the force equals change in momentum' is another alternate form of the second law.

Note

For a particle, equations (1), (2) and (3) are completely equivalent; but for a system with varying mass and for pedagogic reasons, equation (2) is the appropriate form of the law.

Index

3.1 Dynamics of a particle
3.2 Dynamics of a system of particles
3.3 Law of Conservation of Momentum

Chapter 4