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Motion in A Plane

Physics Part I

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Class 10 Class 12

If the magnitude of the two forces are 2 and 3 and the magnitude of their scalar product is 3, then find the angle between the vectors.

Here, A = 2; B = 3 and A. B = 3,

We know that,

A. B = AB cos

So, cos =  = cos 45o

That is    = 45o, is the angle between the vectors.

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What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
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What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

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Give three examples of scalar quantities.

Mass, temperature and energy
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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
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Give three examples of vector quantities.

Force, impulse and momentum.
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