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air resistance

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Air Resistance

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Force tending to oppose the motion of a body as it moves through air. It is a form of friction. An object falling through the air experiences a force due to air particles opposing its motion, which has the effect of slowing down the object. Air resistance is greater for objects moving faster and with greater areas.

As an example, a parachutist jumping from an aircraft will initially accelerate due to the force of gravity. As the speed increases the air resistance slows down the parachutist, reducing the acceleration. Eventually the air resistance balances the force of gravity, at which point the parachutist falls at a constant velocity called the terminal velocity. As the parachute opens, the large area of the parachute experiences greater air resistance than the parachutist, and slows the descent.

© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.


 
 

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