Elastic Collision Formula

The Formula

p_i = p_f \text{ and } KE_i = KE_f

When to use: Billiard balls bouncing off each other: the total energy stays the same, nothing is lost to heat or deformation.

Quick Example

A steel ball bearing bouncing off another of equal mass โ€” the first stops, the second moves at the same speed.

What This Formula Means

A collision in which both the total momentum and the total kinetic energy of the system are fully conserved after impact.

Billiard balls bouncing off each other: the total energy stays the same, nothing is lost to heat or deformation.

Why This Formula Matters

Elastic collision is the idealized model for atomic and molecular collisions.

Frequently Asked Questions

What is the Elastic Collision formula?

A collision in which both the total momentum and the total kinetic energy of the system are fully conserved after impact.

How do you use the Elastic Collision formula?

Billiard balls bouncing off each other: the total energy stays the same, nothing is lost to heat or deformation.

Why is the Elastic Collision formula important in Physics?

Elastic collision is the idealized model for atomic and molecular collisions.

What do students get wrong about Elastic Collision?

Perfectly elastic collisions are rare in everyday life; most real collisions lose some energy.

What should I learn before the Elastic Collision formula?

Before studying the Elastic Collision formula, you should understand: conservation of momentum, kinetic energy.