Final answer:
The key part of the control system along with the steering wheel, accelerator, and brake pedal is the engine.
Step-by-step explanation:
Automotive Engineering - High School
The key part of your control system along with the steering wheel, accelerator, and brake pedal is the engine. The engine is responsible for converting fuel into mechanical power, which propels the vehicle forward or backward.
To further explain, when the gas pedal is pressed down, it increases the flow of gasoline to the engine, resulting in an increase in velocity. On the other hand, pressing the brake pedal or turning the steering wheel also causes changes in velocity, as they respectively reduce the speed and change the direction of the vehicle.