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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 body is projected with a velocity 30 m/sec at angle 30°. After what time will it be at maximum height?

We know,

A projectile is at maximum height at time equal to half of the time of flight.

That is, 

                space space straight t equals fraction numerator straight u space s i n space straight theta over denominator straight g end fraction

Here, we have

Initial space velcoity comma space straight u space equals space 30 space straight m divided by straight s

Angle space of space projection comma space straight theta space equals space 30 degree

Time when the projectile is at maximum height is, 

∴           straight t equals fraction numerator 30 cross times s i n space 30 degree over denominator 9.8 end fraction equals 1.53 straight s 
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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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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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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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