Collision
In short
A collision occurs when two or more bodies exert forces on each other during a brief period of contact. In physics, this event can involve any amount of force, regardless of how much damage is caused.
In plain words
It is what happens when things hit each other. While we usually think of big crashes, even tiny particles bumping into one another are considered collisions in science.
A simple example
A billiard ball hitting another ball on a table is a collision. Even a single atom bumping into another molecule counts as a scientific collision.
Why it matters
Studying collisions helps scientists understand how energy and momentum move through the universe. It is essential for designing everything from car safety features to particle accelerators.
Easy to mix up
Do not confuse a physical collision with a conflict of ideas, which is a disagreement rather than a physical force.