Advanced Topics
In a nutshell: Conservation laws ensure energy and momentum stay constant in isolated systems.
## Physics' Unbreakable Rules
Conservation laws state that certain properties of a system remain constant if no external forces act on it. The most important are conservation of energy and conservation of momentum.
### Energy Conservation
Energy cannot be created or destroyed, only transformed. For example, when you ride a roller coaster, potential energy turns into kinetic energy and back again.
### Momentum Conservation
The total momentum of a closed system remains the same, which explains the motion of objects after a collision.
### Why It Matters
These laws help scientists solve problems and make predictions, from car crashes to rocket launches.
Examples
- Two ice skaters push off each other and glide in opposite directions, conserving momentum.
- A swinging pendulum transforms energy but never loses it in an ideal system.