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**atran****Member**- Registered: 2013-07-12
- Posts: 91

Hi,

There are at least two types of quantity: scalar quantity and vector quantity. Both have magnitude, but only the vector quantity has direction. A unit is a magnitude. Thus, if F is a vector quantity, then |F| is the magnitude of the quantity.

Am I thinking right?

Thanks for help...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,701

|F| is the norm or Euclidean distance from the origin of the vector F,

Sometimes it is written like this.

There are other types of norms.

What is A unit?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**atran****Member**- Registered: 2013-07-12
- Posts: 91

Say x=10 metres: is the magnitude of x 10 or 10 metres? I believe the latter is true.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,701

The magnitude is 10 meters.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**atran****Member**- Registered: 2013-07-12
- Posts: 91

Hi;

The magnitude of a number is its absolute value.

The magnitude of a vector is its length.

The magnitude of a scalar (e.g -10°) is the quantity itself.

Am I thinking right?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,701

Magnitude is always a positive. A scalar is any number. It can be positive or negative.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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