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Photoelectric EffectJEE MathsJEE Chemistry
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JEE Physics
Elastic Collision

Elastic Collision

1.0Definition of Elastic Collision

A collision is termed elastic if there is no loss of kinetic energy due to the interaction. An elastic collision is a type of collision where both kinetic energy and momentum are conserved. In these collisions, the total kinetic energy of the system remains unchanged before and after the event, and the objects rebound off each other without any loss of kinetic energy.

2.0Characteristics of Elastic Collision

  1. The Momentum is conserved.
  2. Total energy is conserved.
  3. The Kinetic Energy is conserved.
  4. Forces involved during the collision are conservative.
  5. The mechanical energy is not converted into heat, light, sound etc.

3.0Examples of Elastic Collision

  • Collision between subatomic particles
  • Rebound of a Rubber Ball

4.0Expression for velocities after elastic collisions

Elastic collision


Table of Contents


  • 1.0Definition of Elastic Collision
  • 2.0Characteristics of Elastic Collision
  • 3.0Examples of Elastic Collision
  • 4.0Expression for velocities after elastic collisions

Frequently Asked Questions

The energy exchange will be maximum if the two colliding bodies are of equal masses.

During the brief moment of contact in an elastic collision, the K.E of the billiard balls is temporarily converted into potential energy. While the total kinetic energy is conserved overall—meaning it is equal before and after the collision—kinetic energy is not conserved during the short period when the balls are in contact.

The collision is elastic because the forces involved are conservative.

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