How can vehicles wheels rotate that freely eventhough there is a massive weight resting on them?

Question

Edit: thank you so much for the clear explanation! It makes so much more sense now!

In: Physics

Answer 1

Because you have wheel bearings that can transfer a lot of force and still have quite low friction. There is very little friction if you roll had object over each other and bearings have material like steel rolling on steel

It is like you put a ball below a had object is will roll when you move the object. Think of what would happen if you stood on a wooden plank on a had surface and but golfball in between. . There is very little friction if you roll had object over each other and bearings have material like steel rolling on steel.
He is a video [how a ball bearing is designed](https://www.youtube.com/watch?v=lIEHscqWJAk)[.](https://www.youtube.com/watch?v=lIEHscqWJAk) Vehicles tend to use cylinders instead of balls but the idea is the same