Momentum is how much something wants to keep it's current motion. This truck would be hard to stop ... ... it has a lot of momentum . 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 . In simpler terms, momentum determines how difficult it is to stop or change the motion of an object. Objects with greater momentum are harder to stop compared to those with lower momentum . Methodology: How to Calculate Momentum To calculate momentum , we follow four key steps: data, unknown, formula , and solution. Learn how to calculate and write the formula for momentum , a vector quantity that measures the motion of a body. Find out the change in momentum formula , the S.I unit, and the examples of momentum in physics.