Why is the speed of rotation decreases near the poles?
Answers
To measure the speed of rotation, there are two types of speeds, linear and angular. The speed of rotation in general, of the Earth, can should be measured by angular speed rather than linear speed.
The angular speed of Earth is that of 360 degrees, in 24 hours. This means that the angular speed at the equator, is the same, as it is on the poles.
However, if we imagine that there is a pole which is connecting the North and South poles, then that would be considered the axis, on which the Earth rotates.
The Equator, is equidistant from both poles. The equator is further away from the (just imagined central pole) than the North and South poles. In this case, the same point on the equator has to travel a larger distance, a larger radius or call it circumference, to get to the same point.
Therefore, the speed of rotation at the poles, decreases.
Formulas can be used to measure this, through velocity. Where velocity is equal to distance divided by time and Speed = Distance / Time
The rotational speed of the earth is measured by angular speed. Due to low distance between the axis of rotation, the angular velocity is low at poles.
this is the reason that the speed of rotation gets decreased near poles. The more study is conducted, easier it will become to obtain the right conclusion.