>>13433994Imagine two balls of the same size rolling down an incline, a ball made out of steel and the other made out of foam. Suppose there is no air and the balls don't slip, so that way they'll have the same velocity by the end of the ramp.
Now, if your tried to stop a ball from rolling down the incline, which one would be easier to stop? Exactly, the one made out of foam, because it is lighter than the steel ball.
Now think about the same two balls but now they are not moving, and you wanna roll them. Which one will be easier to roll? Again, the foam one.
With these two cenarios it's possible to see the correlation between mass and velocity. You saw that the less mass an object has, the easier it is to stop it if it is moving or to move it if it is still, and the harder would be for an object of more mass.
Therefore we say that, how hard is to control the movement of a body is proportional both to it's mass and velocity, and we call this momentum.
