I know it's a regular question, but I'm having a problem with the concept of circular motion.
Intuitively, the earth and people have the same angular velocity，It's because people are standing on the earth. It looks like a centripetal force provided by a component of universal gravitation, not because of friction.
I don’t want to understand through intuition, I know that we can find the centripetal force by knowing the angular velocity, which is the cause of synchronization. But I want to understand from the perspective of force, not speed.
If a person jumps up, it will maintain the same linear velocity. Because the component force of gravitation will perform a circular motion. And this axis of circular motion is also the axis of the earth’s rotation.
I know the reason why man and the earth rotate together, but this is derived from phenomena. Because of this, I say it is due to the component force provided by gravity. If you don’t explain this phenomenon, why does universal gravitation always provide a centripetal force, which happens to be at the same speed as the earth?
Why is this speed moving in a circular motion around the axis of the earth's rotation？I know that in a circular motion, the speed is perpendicular to the force，Why is the axis of circular motion between this linear velocity and gravitation not redefined?
What is the reason that the circular motion of the object when it leaves the surface of the earth still maintains the same axis as the rotation of the earth?
The main problem is here
Ⅰ Through observation of the phenomenon, we can know that it is because of the centripetal force provided by universal gravitation.Why does this centripetal force provide the same speed effect as the earth's rotation speed.Can I explain without phenomenon.
Ⅱ If you leave the surface of the earth，I don’t know how it will be. Suppose that gravitation provides a component perpendicular to the direction of velocity，Make a circular motion.Whether the rotation axis of circular motion is the same as the rotation axis of the earth.Because gravitation provides a component force perpendicular to speed, this direction is uncertain. There are many possibilities.