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Air Resisitance
Link | by Hamtaro0803 on 2010-08-06 00:50:07
Force = Air Resistance? Under what condition?

Re: Air Resisitance
Link | by gendou on 2010-08-06 09:50:44
When an object is moving quickly through the air, and no other external forces are applied.

Re: Air Resisitance
Link | by on 2010-08-06 13:47:56 (edited 2010-08-06 13:48:27)
Force equals air resistance (drag) when an object hits terminal velocity. That is the point when the object is unable to gain anymore velocity.

Fdrag=1/2p * v2 * A * C

Where p is the density of the fluid, v is the velocity of the object, A is the reference area perpendicular to the direction of travel, and C is the drag coefficient.

At a certain point, the force due to acceleration will equal the force due to drag. At this point, the only way to move faster is to increase the rate of acceleration.

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Re: Air Resisitance
Link | by inuroks on 2011-03-07 23:43:48
I disagree with Stoney .

When a body reaches its terminal velocity , net force is zero ,it is not equal to air drag .

Net force is equal to air resistance only when the body is projected in a gravity free space containing only air . ( NOTE :Even in this condition , there is a very minute fore of attraction due to the air molecules , but it can be neglected.)

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