Answer to Question #266373 in Mechanics | Relativity for Faru

Question

What is quantity of motion?

Answer 1

In a body, the relative amount of its motion, as measured by its momentum, varying as the product of mass and velocity.

The main quantity that measures the motion of a body is momentum. An object's momentum increases with the object's mass and with its velocity. The total momentum of all objects in an isolated system (one not affected by external forces) does not change with time, as described by the law of conservation of momentum.