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Thread: What Are Vectors ???

  1. #1 What Are Vectors ??? 
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    I am new to this forum... nd Also new to physics... yesterday our teacher gives lecture about Vectors... but I can't understand any thing... doesn't know why ????
    I want to ask that what are vectors and... Why we use vectors ?????


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    Moderator Moderator Markus Hanke's Avatar
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    Vectors are quantities which have both magnitude and direction. You can picture them as arrows - an arrow has a certain length, and points in a certain direction. That's what a vector is.
    We use them in physics because many of the things we investigate have not just magnitude, but direction as well. Trivial example : the velocity of an object. When an object moves it has both a certain speed, and it moves in a certain direction. You could of course treat those separately, but it turns out it is much easier to combine them both into a vector - the velocity.


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    what is mean by addition of vectors and it's components...
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    Quote Originally Posted by Xidike View Post
    what is mean by addition of vectors and it's components...


    You can add two vectors together - practically that means you line up to arrows end-to-end. Mathematically you do it by simply adding the respective components of the two vectors.

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    what are it's components...?
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    Scalar multipliers of a privileged set called "basis vectors".
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  8. #7  
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    Quote Originally Posted by Xidike View Post
    what are it's components...?
    One way to represent a vector is to give a set of standard numbers ("scalars"). For a 2D space, we give two, one for the x-axis and one for the y-axis. If you draw an arrow between the 0,0 point to the point given by your vector, you have an arrow of a certain length in a certain direction. These numbers are the components.
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