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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
How can you explain that the flying of a bird is an example of resultant of two vectors? 


Flying of a bird is an example of resultant of two vectors.

i) When the bird flies, it strikes the air with wings A and B towards O along AO with rightwards arrow on top space and space stack BO. with rightwards arrow on top 

ii) Action and reaction are opposite. Therefore, the air strikes the wings in opposite direction i.e. along space OA with rightwards arrow on top space and space OB with rightwards arrow on top.

iii) The resultant of these vectors is in the upward direction which balances the weight of the bird.


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Give three examples of vector quantities.

Force, impulse and momentum.
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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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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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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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Give three examples of scalar quantities.

Mass, temperature and energy
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