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Is there such a speed slower than no speed at all?

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TheEngineer

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Re: Is there such a speed slower than no speed at all?
« Reply #90 on: November 17, 2007, 11:15:44 AM »
Quote from: Trustee on November 17, 2007, 10:57:29 AM
A negative vector is mathematically possible, but it does represent poor notation and should always be avoided.
Why should it be avoided?  I happen to like negative vectors, especially since my choice of coordinate system makes them.
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Gulliver

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Re: Is there such a speed slower than no speed at all?
« Reply #91 on: November 17, 2007, 09:21:36 PM »
Quote from: TheEngineer on November 17, 2007, 11:15:44 AM
Quote from: Trustee on November 17, 2007, 10:57:29 AM
A negative vector is mathematically possible, but it does represent poor notation and should always be avoided.
Why should it be avoided?  I happen to like negative vectors, especially since my choice of coordinate system makes them.

If they are useful to you, great. As a general rule it is better to avoid redundant sets, it increases the risk of human error.
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Jack

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Re: Is there such a speed slower than no speed at all?
« Reply #92 on: November 17, 2007, 09:46:21 PM »
Quote from: Trustee on November 17, 2007, 10:57:29 AM
A negative vector is mathematically possible, but it does represent poor notation and should always be avoided. We have a set of all possible vectors consisting of only positive vectors, introducing negative vectors into that set is redundant.
I don't see any problem with negative vectors, especially, for example, if you're using Pythagoras theorem to find the resultant vector.

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Trekky0623

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Re: Is there such a speed slower than no speed at all?
« Reply #93 on: November 18, 2007, 11:44:54 AM »
Vectors run along and x-y axis, which MUST have negative vectors unless you position it so that it avoids them.

Why should you avoid them?  They're helpful in x-y coordinates.
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Gulliver

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Re: Is there such a speed slower than no speed at all?
« Reply #94 on: November 18, 2007, 05:56:37 PM »
Quote from: Trekky0623 on November 18, 2007, 11:44:54 AM
Vectors run along and x-y axis, which MUST have negative vectors unless you position it so that it avoids them.

Why should you avoid them?  They're helpful in x-y coordinates.

There are many different types of vectors. I'm talking about the subspaces where defined vectors have a redundant pairing.
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TheEngineer

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Re: Is there such a speed slower than no speed at all?
« Reply #95 on: November 18, 2007, 06:05:13 PM »
Quote from: Trustee on November 17, 2007, 10:57:29 AM
A negative vector is mathematically possible, but it does represent poor notation and should always be avoided.
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Raist

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Re: Is there such a speed slower than no speed at all?
« Reply #96 on: November 19, 2007, 06:06:10 AM »
To all the people that say negative velocitie are bad, how do you calculate accelerations due to gravity with wind resistance. I know that that is acceleration, but since the second time is not negative I'll assume one of the velocities has to be negative.
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Gulliver

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Re: Is there such a speed slower than no speed at all?
« Reply #97 on: November 20, 2007, 07:01:13 PM »
Quote from: The More You Know on November 18, 2007, 05:56:37 PM
There are many different types of vectors. I'm talking about the subspaces where defined vectors have a redundant pairing.
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Loard Z

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Re: Is there such a speed slower than no speed at all?
« Reply #98 on: November 21, 2007, 05:49:05 AM »
what about travelling in an imaginary direction? what would that constitute?
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