What’s effect of rotation of earth on value of G at equator is minimum & that at pole is maximum & earth starts rotating at greater angular speed?
As the polar radius is smaller than the equatorial radius, therefore the acceleration due to gravity is maximum at poles and minimum at the equator. If earth ceases to rotate, the weight of a body at equator will increase. But no effect on the weight at poles. The effect of rotation of the earth on acceleration due to gravity is to decrease its value. Therefore if the earth stops rotating, the value of g will increase. The formation of days and nights happens due to the rotation of the Earth on its axis. If the Earth starts rotating faster, it would complete one complete spin in less than 24 hours. Hence the length of the day will decrease.