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Motion in A Plane

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A projectile is projected horizontally with velocity u. What will be the velocity of the projectile after time t ?

Let a projectile be projected with velocity u in horizontal direction.



If straight v subscript straight x space and space straight v subscript straight y are X and Y components of velocity at any instant, then

         straight v subscript straight x equals straight u subscript straight x plus straight a subscript straight x straight t space space equals space u space a n d

straight v subscript straight y equals straight u subscript straight y plus straight a subscript straight y straight t space equals space gt

therefore space space space space straight v with rightwards arrow on top space equals space straight v subscript straight x straight i with hat on top space plus space straight v subscript straight y straight j with hat on top 

Now manitude of resultant velocity is,

       space space straight v equals square root of straight v subscript straight x superscript 2 plus straight v subscript straight y superscript 2 end root space
space space space equals space square root of straight u squared plus straight g squared straight t squared end root

The angle which the velocity vector makes with horizontal is,
                             tanθ equals gt over straight u



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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.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

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. 


814 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views