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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 trains travelling on the same track are approaching each other with the equal speed of 40 m/s. The drivers of the train begin to deaccelerate simultaneously when just 2.0 km apart. Assuming deacceleration to be uniform and equal, the value of the deacceleration to barely avoid collision should be? 


We have, 

Initial speed, u = 40 m/s 

Distance to be covered by each train before rest, s = 1000 m 

Acceleration, a = ? 

Using the relation, 

                  v2 = u2 + 2as

We have, 

straight a space equals space fraction numerator left parenthesis straight v squared space minus space straight u squared right parenthesis over denominator 2 straight s end fraction space
space space space equals space fraction numerator 0 space minus space left parenthesis 40 right parenthesis squared over denominator 2 space straight x space 1000 end fraction space

space space space equals space 0.8 space straight m divided by straight s squared
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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.
865 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 is a scalar quantity?

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