DMPQ-. Discuss the forces affecting velocity and direction of wind.

The wind blows from high pressure to low pressure. The wind at the surface experiences friction. In addition, rotation of the earth also affects the wind movement. The force exerted by the rotation of the earth is known as the Coriolis force. Thus, the horizontal winds near the earth surface respond to the combined effect of three forces – the pressure gradient force, the frictional force and the Coriolis force. In addition, the gravitational force acts downward.

Pressure Gradient Force

The differences in atmospheric pressure produces a force. The rate of change of pressure with respect to distance is the pressure gradient. The pressure gradient is strong where the isobars are close to each other and is weak where the isobars are apart.

Frictional Force

It affects the speed of the wind. It is greatest at the surface and its influence generally extends upto an elevation of 1 – 3 km. Over the sea surface the friction is minimal.

Coriolis Force

The rotation of the earth about its axis affects the direction of the wind. This force is called the Coriolis force after the French physicist who described it in 1844. It deflects the wind to the right direction in the northern hemisphere and to the left in the southern hemisphere. The deflection is more when the wind  velocity is high. The Coriolis force is directly proportional to the angle of latitude. It is maximum at the poles and is absent at the equator.

KPSC Notes brings Prelims and Mains programs for KPSC Prelims and KPSC Mains Exam preparation. Various Programs initiated by KPSC Notes are as follows:- For any doubt, Just leave us a Chat or Fill us a querry––

Hope we have satisfied your need for KPSC Prelims and Mains Preparation

Kindly review us to serve even better


KPSC Mains Test Series 2020

20 Quality mock tests and GS Mains Notes

Mains Test Series and Notes

Mains Printed Notes (With COD)


KPSC Prelims Test Series 2020

24 Quality mock tests and GS Prelims Notes

Prelims Test Series and Notes

Prelims Printed Notes (With COD)

Subscribe to KPSC Notes

Never Miss any KPSC important update!

Join 1,939 other subscribers

error: Content is protected !!