Why do wheels help vehicles move smoothly on the road?

🧠 Detailed Explanation (For Older Kids)

Wheels are round, which means they can spin fast and smoothly on the ground. When a vehicle has wheels, it can glide along surfaces without much effort, making it easier to move quickly. This is because rolling creates less friction than sliding, so it takes less energy to go from one place to another. Next time you see a vehicle, remember: without wheels, it would be much harder for it to move!