Here's how it works:
1. Chemical energy in the fuel is released through a process called combustion.
2. Combustion is a chemical reaction where the fuel reacts with oxygen, producing heat and expanding gases.
3. The expanding gases push on a piston, converting heat energy into mechanical energy.
4. This mechanical energy is then used to turn the wheels and move the car.
Therefore, the primary energy transformation in a car involves converting chemical energy from fuel into mechanical energy that powers the vehicle.