what does basically momentum mean? what is elastic and inelastic momentum? please, if possible, answer the first question at first.
Momentum is a property that a body has, if it has mass and is moving. The amount of momentum is calculated by multiplying mass and velocity. If p is momentum, m mass and v velocity then p=mv. The interesting thing about momentum is that the amount of it in a system doesn't change if bits of the system crash into each other. We say that momentum is conserved.
Elastic and inelastic describe collisions, not momentum. Two billiard balls that rebound from one another might be described as being involved in an elastic collision. A billiard ball striking a ball of putty might be inelastic. Momentum would be conserved in each case.
in short, momentum is like saying the 'motion' of an object. the difference is, motion is simply a speed and direction without taking into account the mass of the object! (the momentum is the speed and direction AND the mass)
the law that says MOMENTUM is always CONSERVED, works like this - if one ball hits directly straight into a second ball (with the same mass), the first ball would stop and the second ball would start moving off with exactly the same motion as the first one (it would look like one ball kept moving straight through to the other). Now imagine the same thing again, exept this time the second ball has a much bigger mass. It would collide and the big ball would move off alot more slowly. the speed of the big ball is slower because the mass is larger, so the momentum remains the same (momentum considers mass).