This centripetal force has a direction perpendicular to the velocity vector, tha

Question

This centripetal force has a direction perpendicular to the velocity vector, that is tangential to the circle formed by the rotation of anybody sitting on the surface of or around Earth. What is this force? And what is the physical origin of this force?

In the same category, what is the nature of the centripetal force in the following cases:

- an electron orbiting the nucleus of an atom,
- a moon around a planet
- a star around the center of a galaxy
- a bob attached at the end of a string that spins vertically

Explanation / Answer

a) electric force

b) graviational force

c) graviation force

d) tension in the rope

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