Movement is a part of our day-to-day lives. But what is it that measures our movement? It’s momentum. In Physics, Momentum refers to the quantity of motion that an object has. It can be defined as “mass in motion”. Any slightest of object that has mass and moving is said to have momentum. The higher the momentum of the body, the higher force is required in the negative direction to stop it. We might have heard a person is on roll. It means, in an ironic way, if a person has gained momentum its difficult to bring him down.