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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
Two projectiles are projected at angles θ and (90°–θ) with same speed. What is the ratio of their time of flight?

Time of flight is given by fraction numerator 2 space straight u space sinθ over denominator straight g end fraction
So ratio of time of flight = fraction numerator begin display style bevelled fraction numerator 2 space straight u space sinθ over denominator straight g end fraction end style over denominator begin display style bevelled fraction numerator 2 space straight u space sin space left parenthesis 90 to the power of straight o minus straight theta right parenthesis over denominator straight g end fraction end style end fraction space 

                                    equals space fraction numerator sin space straight theta over denominator cos space straight theta end fraction space

equals space tan space theta space thin space colon space 1


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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 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 scalar quantities.

Mass, temperature and energy
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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 vector quantities.

Force, impulse and momentum.
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