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Multiple choice questions

Q.Polar fleeing force relates to:

(a) Revolution of the Earth
(b) Gravitation
(c) Rotation of the earth
(d) Tides
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✓ Free question

The polar fleeing force is a direct consequence of the Earth’s rotation, not its revolution, gravity, or tides.

The phrase “polar fleeing force” sounds like something out of a physics puzzle, but it is really a story about how the Earth’s spin reshapes the very ground beneath our feet. Imagine a ball of dough spinning on a baker’s counter. The faster it spins, the more it flattens at the top and bottom and bulges out at the middle. The Earth does exactly the same thing, only on a planetary scale, and the force responsible for that flattening is what we call the polar fleeing force.

Here is the key idea: because the Earth rotates, every point on its surface is moving in a circle. But not every point moves at the same speed. A point on the equator traces a huge circle every 24 hours, so it races along at roughly 1,670 kilometres per hour. A point near the North Pole traces a tiny circle in the same time, so it crawls along at almost nothing. This difference in speed creates an outward pull, a centrifugal effect, that is strongest at the equator and weakest at the poles.

That outward pull is the polar fleeing force. It does not literally “flee” anywhere, but it acts as if the material of the Earth is trying to escape from the axis of rotation. The result is that the Earth is not a perfect sphere. It is an oblate spheroid — slightly squashed at the poles and slightly swollen at the equator. The equatorial diameter is about 43 kilometres larger than the polar diameter. That bulge is the polar fleeing force made visible.

Now, why not the other options? Revolution of the Earth is the yearly journey around the Sun. That motion gives us seasons and changes the Sun’s apparent path, but it does not produce any noticeable flattening of the planet itself. Gravitation pulls everything toward the centre of the Earth; it is the force that holds the bulge together, not the force that creates it. Tides are caused by the gravitational pull of the Moon and the Sun on the oceans, and they have nothing to do with the Earth’s spin shaping its solid body.

Note

The polar fleeing force is sometimes called the centrifugal force due to rotation. It is not a “real” force in the strict physics sense — it is an apparent force that appears because we are observing from a rotating frame. But for geography and earth science, treating it as a real push outward is perfectly useful.

Important

The same force that flattens the Earth also explains why the equator bulges and why the poles are slightly closer to the centre. It is also why a pendulum swings slightly differently at the equator than at the poles, and why the value of gravity is a touch weaker at the equator — you are a little farther from the centre there, and the outward pull is strongest.

So when you see the term “polar fleeing force,” think of a spinning top, not a planet drifting through space. It is entirely a product of the Earth’s daily rotation on its own axis.

✓Final answer

In short, the polar fleeing force arises from the rotation of the Earth, which flattens the planet at the poles and bulges it at the equator. The correct option is (c) Rotation of the earth.

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