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When a stone is thrown into the air it's surface will be in contact with the surrounding air. Analyse the stresses existing between the stone and the surrounding air.
14 years ago

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drwls
The collisions of the stone with air molecules tend to slow the stone down slightly. A frictional force called drag is exerted upon the stone. It is of two types: (1) pressure drag (higher pressure in front that behind) and (2) boundary layer friction along the sides.
14 years ago

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