Relier Pairs DynamicsVersion en ligne reinforce the difference between inelastic and perfectly elastic collisions par Muhammad Kashif Jamal - 44214/Coordinator/BSSK 1 Kinetic energy is conserved in a perfectly elastic collision; 2 Newton’s first law of motion: 3 Newton’s third law of motion: 4 In all interactions or collisions, 5 Newton’s second law of motion: 6 In an inelastic collision, kinetic energy is not conserved. The resultant force acting on a body is equal to the rate of change of its momentum. An object will remain at rest or keep travelling at constant velocity unless it is acted on by a resultant force. When two bodies interact, the forces they exert on each other are equal and opposite. It is transferred into other forms of energy (such as heat or sound). Most collisions are inelastic. momentum and total energy are conserved. relative speed is unchanged in a perfectly elastic collision.