Question

Which factor provide a centripetal force in the following cases:
i) revolution of electron around the nucleus.
ii) revolution of earth around the sun.
iii) circular motion of a cyclist.

Answer 1

1) The Gravitational attraction force of the Sun on Planet provides the required centripetal force.

2) motion of an electron around the nucleus in an atom

The electrostatic attraction force between the protons and the electrons provides the required centripetal force.

3) The frictional force between tyre and road provide centripetal force