What is Momentum in Physics? The concept of Momentum in physics is very important, without which most of the theories in physics will fail. The momentum can be calculated by multiplying the mass of the substance and its velocity. In physics, momentum is of different types and forms. Let's know more about momentum and its formula. Momentum is the product of a particle’s mass and its velocity. As momentum has both direction and magnitude, it is a vector quantity. The second law of motion (proposed by Issac Newton) shows that the change rate (time) of momentum equals the force exerted on the particle. There are two types of momentum : linear momentum and angular momentum . What is momentum ? Learn the formula and units of the momentum of a moving object. Understand the principle of conservation of momentum with its... Momentum is the product of mass and velocity of an object. Learn how to calculate momentum , impulse, and change in momentum , and see how they relate to force and collision.