Question

if earth stops rotating what is it effect on centrepetakl force

Answer 1

The, centrepetal force become zero.
and our blue green Bob (earth) will fly with a greater speed.

Answer 2

When earth rotates it produces some centrifugal force on the objects on its surface. The value of this centrifugal force is highest on equator and lowest on poles. ... So if earth stops rotating then the value of g will increase at equator to poles in descending order.