Mass:Mass is the measure of the amount of matter in an object. It determines how much inertia an object has.
Newton's First Law: Also known as the law of inertia, it states that an object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and direction unless acted upon by an external force.
Momentum:Momentum is a property of moving objects and depends on both mass and velocity. It describes how difficult it is to stop or change the motion of an object.