Suppose you attach a weight to one end of a spring and then hold the other end of the spring and spin it above your head. The faster you spin the spring, the farther away the weight will move from your hand. This example illustrates:

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This example is illustrating centrifugal force, which is the force that pulls outward on an object moving in a circle. This force causes the weight on the end of the spring to move away from the center of rotation, similar to how the equator bulges out on a planet due to the centrifugal force from its rotation. Saturn is the most oblate of the gas giant planets because it rotates very quickly, causing its equator to bulge out more than the other gas giants.

Suppose You Attach a Weight to One End of a Spring