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Old 10th April 2004, 02:42 PM   (permalink)
Default Dot Product & Cross Product

Hello,

May i know what cases to use dot product and cross product?
Pls advise.
Thanks.
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Old 10th April 2004, 03:18 PM   (permalink)
Default Re: Dot Product & Cross Product

Quote:
Originally Posted by shermaine
Hello,

May i know what cases to use dot product and cross product?
Pls advise.
Thanks.
If you google for +"dot product" +"cross product" you get plenty of hits, is there any electronic reason for the question?. Probably if you don't know which to use, you don't need them!.
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Old 10th April 2004, 10:59 PM   (permalink)
Default

cross product yields a vector quantity that is orthogonal to both vectors that you crossed

dot product yields a scalar quantity. a simple appliaction is work = F (dot) d
F(dot)d = mag(F) mag(d) cos THETA

so if you use that for work, you automatically get the component of the force that is doing the work (in the same direction)

good luck

david
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david
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