Car, bike wheel why make round? Axle should be installed there?
Driving smoothly, the center of the heart
Round the resistance of the small scattered, the axle must be installed in the middle of scattered, so that the use of force are small scattered
If the wheel is rounded and the axle is on the center of the circle, the distance from the ground when the wheel is rolling on the ground is always equal to the wheel radius. So the car mounted on the axle, the car sitting in the people, will be gently pulled by the car. Assuming that the wheel is a broken, has not rounded, the rim on a high one low, that is from the rim to the wheel center of the distance are not equal, then the car walk up, be sure to take your Head faint.
