What is Centrifugal Force? Is it of any use to us?

Centrifugal Force
If you tie a weight to the end of a string and whirl it round and round in a circle, the weight tries to fly away in a direction at right angles to the string. The string compels it to follow a circle path, so the string is pulled on by the weight; or to look at the matter the other way round, the string pulls on the weight – with a force which is called centrifugal force. The force increases much more quickly than the number of revolutions per minute. The best example of this phenomenon is the swings ride (see photo) each seat of which, suspended by chain, tries to fly away when the wheel revolves at high speed.

Yes, the centrifugal force is turned to account in many ways. The speed of many engines is controlled by a centrifugal governor, with whirling balls which fly further apart as the speed increases and move levers that reduce the supply of steam or gas. Cream is separated from milk, water from wet clothes, molasses from sugar, by centrifugal apparatus. Pipes are cast centrifugally by pouring molten metal into rapidly revolving molds. Centrifugal force keeps a circular saw stiff, is applied to the pumping of water, and is depended on to release the safety-belt in a shell fuse as the shell leaves the gun.

Additional reading:
Centrifugal force (Wikipedia)

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