Linear momentum is one of important aspect used to explain the motion of a body in a straight line. Linear momentum is obtained as the product of mass and velocity A body with a larger mass and the one with smaller mass will possess different amount of momentum when moving with same velocity. A body with smaller mass can be stopped easily compared to the one with the larger mass. That is to say, larger mass bodies possess large momentum than smaller mass bodies. Linear momentum has both magnitude and direction. The SI unit of linear momentum is simply the combination of the individual SI units of mass and velocity. Therefore, the SI unit of linear momentum is Kilogram -Metre per second (kgm/s). The linear momentum is determined by measuring the mass of the body and its velocity. A body with large mass and moving with high velocity possess large momentum. Since them mass of the body remains constant in most of the times, the momentum will only change if its velocity changes. What is a linear momentum of a 10ton lorry moving with 60m/s? A ball weighing 3kg has been kicked and found to move at 35m/s. Calculate the linear momentum of the ball. This law explains the effect of the external force on the momentum of the body. The applied force can increase or decrease the momentum of the body. The rate of the momentum change depends on the amount of the applied force.