What is the final factor that determines if a vehicle will move?

The ability of a vehicle to move ultimately hinges on the traction provided by its tires on the road surface. Traction is the friction between the tires and the ground, which is essential for converting the engine's power into forward motion. If the tires do not have adequate traction, the vehicle can struggle to start moving, even if the engine is producing sufficient power and there is fuel in the tank.

For example, on slippery surfaces like ice or wet pavement, a vehicle can have a powerful engine, but if the tires cannot grip the road effectively, the vehicle will not move forward as intended. This emphasizes the critical role traction plays in the overall movement of the vehicle.