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

There are bearings between the axle and the parts that move relative to the axle (wheel or chassis). Bearings, little metallic spheres, can spin with very little friction, no matter the weight put on them. So the massive weight pushes down on the bearings, which pushes the axle (but allows it to spin), which pushes on the wheels, which push on the ground.