Difference Between Vectors and Scalars

In summary, vectors are mathematical objects that have both a numerical value and a direction, while scalars are simply numbers. The main difference between the two is how they are added and subtracted. However, the concept of vectors encompasses much more than just magnitude and direction, as they can be combined linearly to produce more of the same kind of objects. This means that there are examples of vectors that do not have a notion of direction or magnitude.
  • #1
AnthreX
47
0
whats the difference between

Vectors and Scalars

thanx
 
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  • #2
Open a book on vectors and read the definitions!

I'm not (just) being facetious. There are several different ways of looking at, and thinking about, vectors and the answer to your question depends upon which one you mean.

In the simplest sense (what I think of as the "Physics" definition) vectors are things that have both a numerical value and a "direction". Scalars are simply numbers. One defines "scalar multiplication", multiplying a scalar by a vector, as multiplying the numerical value of the vector by the scalar (so we are multiplying a number by a number) while leaving the direction of the vector unchanged.

That's probably the definition you want.
 
  • #3
ohhh i c...

thanx
 
  • #4
Scalars are magnitude
Vectors are magnitude AND direction.
The major difference is how they are added and subtracted, but that's another story...
 
  • #5
Vectors are magnitude AND direction.
The notion of vector really encompasses much, much more than this. Essentially, vectors are any mathematical objects that can be combined linearly to still produce more of the same kind of objects. That so, there are plenty of examples of vectors that don't present any notion of "direction" (or even "magnitude" -- not all vector spaces have norms.) The space of continuous functions on the interval [-1,1] is a vector space, but it would be hard to say that the functions that comprise it have a "magnitude and direction."
 

What is the difference between vectors and scalars?

Vectors and scalars are both types of mathematical quantities, but they have some key differences. Vectors represent both magnitude (size or amount) and direction, while scalars only represent magnitude. This means that vectors have both a numerical value and a directional component, while scalars only have a numerical value.

How are vectors and scalars used in science?

Vectors and scalars are commonly used in science to describe physical quantities and processes. Vectors are often used to represent forces, velocities, and accelerations, while scalars are used to represent quantities like temperature, mass, and time. Understanding the difference between vectors and scalars is important for accurately describing and analyzing physical systems.

Can vectors and scalars be added or subtracted?

Yes, vectors and scalars can both be added and subtracted, but the process is different for each. Vectors are added or subtracted using vector addition, which takes into account both magnitude and direction. Scalars, on the other hand, are simply added or subtracted using basic arithmetic, as they only have a numerical value.

How do you represent vectors and scalars graphically?

Vectors are often represented graphically using arrows, with the length of the arrow representing the magnitude and the direction of the arrow representing the direction. Scalars, on the other hand, are typically represented by a single value on a graph, such as a point on a number line or a bar on a bar graph.

What are some real-world examples of vectors and scalars?

Vectors and scalars can be found in many real-world phenomena. Some common examples of vectors include velocity (speed and direction), force (magnitude and direction), and displacement (distance and direction). Scalars can be found in quantities like temperature, mass, and time, which only have a numerical value and do not have a direction associated with them.

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