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kasheee
 Post subject: velocity
PostPosted: Sun, 21 Jun 2009 20:30:46 UTC 
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Is the resultant force zero for an object that travels at constant velocity?

Also, why does the air resistance build up gradually and not instantly in order to get to a point when a parachutist has terminal velocity? Thanks.
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skeeter
 Post subject: Re: velocity
PostPosted: Sun, 21 Jun 2009 21:38:26 UTC 
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kasheee wrote:
Is the resultant force zero for an object that travels at constant velocity?

yes, constant velocity says zero acceleration.


Also, why does the air resistance build up gradually and not instantly in order to get to a point when a parachutist has terminal velocity?

because air resistance is a function of velocity. there must be motion relative to the air mass for the air mass to exert any sort of resistance.
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