Automobile is the best example to explain physical system. Why?

1. Mechanics / Dynamics

F=ma (Newton’s law) : Acceleration system

Friction law : Brake system

Rotation dynamics : Tire, curve driving, rain wiper …

Momentum / Energy conservation : Collision simulation and car accident

2. Electromagnetism

Maxwell’s law : Radio antenna

Ohm’s law / Kirchhoff’s law : Battery electronics, Fuse system, …

Faraday’s cage : Car body is safe from lightning.

3. Thermodynamics / Statistic physics

Carnot engine : 4-cycle engine

4. Wave mechanics

Sonology : car audio system

Noise reduction from outside

5. Optics

Lense system : head light, rear light (Parabolic mirror)

Of course, there are so many technical features that I don’t mention above and I don’t know.

Some people ask for what is physics useful. This is an answer.