• In Newtonian mechanics, linear momentum, translational momentum, or simply momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction in three-dimensional space.


  • A collision is the event in which two or more bodies exert forces on each other in about a relatively short time.


  • Impulse is the change of momentum of an object when the object is acted upon by a force for an interval of time.

Elastic Collision

  • An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions.

Inelastic Collision

  • An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved due to the action of internal friction. In collisions of macroscopic bodies, some kinetic energy is turned into vibrational energy of the atoms, causing a heating effect, and the bodies are deformed.


  • It is how fast an object is moving. Velocity, by definition, is a vector quantity that indicates distance per time and direction.