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 The Trek BBS Speed versus velocity?

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 April 23 2010, 04:23 AM #1 ReadyAndWilling Fleet Captain Speed versus velocity? hey guys, can anyone explain to me the difference between speed and velocity? thanks
 April 23 2010, 07:05 AM #2 sojourner Admiral     Location: I'm at WKRP Re: Speed versus velocity? http://dictionary.reference.com/browse/speed http://dictionary.reference.com/browse/velocity Um, none? __________________ Baby, you and me were never meant to be, just maybe think of me once in a while...
April 23 2010, 07:13 AM   #3
PurpleBuddha

Re: Speed versus velocity?

 ReadyAndWilling wrote: hey guys, can anyone explain to me the difference between speed and velocity? thanks
Do you mean acceleration vs velocity?

 April 23 2010, 07:19 AM #4 sojourner Admiral     Location: I'm at WKRP Re: Speed versus velocity? ^ Yea, that's easy. Acceleration is how long it takes something to get up to speed. Example: You know a car can do 60mph. 60mph is the speed. How long does it take the car to go from 0mph to 60mph? That would be it's rate of acceleration. __________________ Baby, you and me were never meant to be, just maybe think of me once in a while...
 April 23 2010, 07:30 AM #5 PurpleBuddha Rear Admiral Re: Speed versus velocity? ^ That. Or put even more simply, acceleration is the rate of change in velocity.
 April 23 2010, 03:20 PM #6 Pavonis Commodore Re: Speed versus velocity? Speed is a scalar. Velocity is a vector. That's a distinct and fundamental difference between the two terms. It's the difference between "Drive 50 mph to get to my house" and "Drive 50 mph north to get to my house".
 April 23 2010, 03:34 PM #7 Jadzia on holiday   Location: England Re: Speed versus velocity? It's similar to the distinction between distance and position. __________________ .
April 23 2010, 04:44 PM   #8
Lindley
Moderator with a Soul

Location: Bonney Lake, WA
Re: Speed versus velocity?

 Pavonis wrote: Speed is a scalar. Velocity is a vector. That's a distinct and fundamental difference between the two terms. It's the difference between "Drive 50 mph to get to my house" and "Drive 50 mph north to get to my house".
That's it exactly.

A velocity in 3D space might look like <5, 6, 7> in the x,y,z directions. But the assocated speed would be sqrt(5*5+6*6+7*7) = 10.5.

Speed and velocity reduce to the same thing in a 1-dimensional space.
__________________
"So apparently the really smart zombies have automatic weapons!"
-Torg, Sluggy Freelance

April 23 2010, 05:03 PM   #9
Asbo Zaprudder

Location: etherized upon a table
Re: Speed versus velocity?

 Lindley wrote: Speed and velocity reduce to the same thing in a 1-dimensional space.
[nitpick] Not quite, an object could have a speed of 5 m/s in either the +ve or -ve direction, which would be equivalent to velocities of +5 m/s or -5 m/s respectively. [/nitpick]

 April 23 2010, 05:07 PM #10 Lindley Moderator with a Soul   Location: Bonney Lake, WA Re: Speed versus velocity? Okay, granted. __________________ Lead Organizer for EVN: Firefly. "So apparently the really smart zombies have automatic weapons!" -Torg, Sluggy Freelance
April 24 2010, 05:38 PM   #11
Fleet Captain

Re: Speed versus velocity?

 Pavonis wrote: Speed is a scalar. Velocity is a vector. That's a distinct and fundamental difference between the two terms. It's the difference between "Drive 50 mph to get to my house" and "Drive 50 mph north to get to my house".
hey man, thanks for the reply. can you explain that example a bit more?

 April 24 2010, 05:57 PM #12 The Badger Fleet Captain     Location: Im in ur Tardis, violating ur canon. Re: Speed versus velocity? Speed is how fast something travels. Velocity is how fast something travels in a particular direction.
 April 24 2010, 07:17 PM #13 sojourner Admiral     Location: I'm at WKRP Re: Speed versus velocity? ^Sounds the same to me. Unless you view velocity as a subset of speed? __________________ Baby, you and me were never meant to be, just maybe think of me once in a while...
 April 24 2010, 07:18 PM #14 FordSVT Vice Admiral     Location: Atlantic Canada Re: Speed versus velocity? I'll say it again in another way just for fun! Speed = rate of movement over time. 50 meters per second, a scalar quantity. Velocity = rate of movement over time + a direction. 50 meters per second @ 45 degrees, a vector quantity. Ooooo! Ooooo! Rule of thumb! Rule of thumb! Lets add some! __________________ -FordSVT-
 April 24 2010, 07:36 PM #15 DonIago Rear Admiral   Location: Burlington, VT, USA Re: Speed versus velocity? Velocity specifies direction, speed does not. __________________ --DonIago It was the best of Trek, it was the worst of Trek... "If I lean over, I leave myself open to wedgies, wet willies, or even the dreaded Rear Admiral!"

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