As I just learn about the rolling motion which is the combination of pure translation and pure rotation. The top portion of the rolling body has the speed of double speed at the center of the object while the bottom one has no speed
Also, it can be view as the rotation that take the axis at the bottom portion
However, comparing both of those 2 explaination with the thing I see in real life, in this case, the rolling wheel, and in dynamical analysis, why the bottom having no speed can move?
For example, a rolling wheel on the street, let say the bottom of the wheel has no speed but the wheel is a rigid body and as time gone by, it move a distance so the bottom must have speed to move but as the definition the bottom have no speed which mean it is stationary so what make its displacement if there is no speed