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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 car travels along a straight line for first half time with speed 40 km/hr and the second half time with speed 60 km/hr. Find the mean speed of the car? 

Mean speed of car,


straight v subscript straight m space equals space fraction numerator straight v subscript 1 straight t subscript 1 space plus space straight v subscript 2 straight t subscript 2 over denominator straight t subscript 1 space plus space straight t subscript 2 end fraction space

space space space space space space equals space fraction numerator 40 space straight x space left parenthesis straight t divided by 2 right parenthesis space plus space 60 space left parenthesis straight t divided by 2 right parenthesis over denominator left parenthesis straight t divided by 2 space plus space straight t divided by 2 right parenthesis end fraction

space space space space space equals space 50 space km divided by hr

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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 scalar quantity?

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

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

Mass, temperature and energy
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