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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, each of length 100 m, are running on parallel tracks. One overtakes the other in 20 seconds and one crosses the other in 10 second. Calculate the velocities of each train? 

Let u and v be the velocity of two trains A and B. While overtaking the relative velocity of train A w.r.t B = u -v. 

While crossing, the relative velocity of train A w.r.t B = u+ v.

Total distance to be travelled by car A while crossing = 100 + 100 = 200 

So, 

space space space space space space space space space space 20 space equals space fraction numerator 200 over denominator straight u space minus space straight v end fraction space

rightwards double arrow space space straight u space minus straight v space equals space 10

Also comma space

space space space space space space space space space space space space space 10 space equals space fraction numerator 200 over denominator straight u space plus space straight v end fraction

rightwards double arrow space space space space straight u plus straight v space equals space 20 space

On space solving comma space we space get

straight u space equals space 15 space straight m divided by straight s comma space is space the space velocity space of space first space train comma

straight v space equals space 5 space straight m divided by straight s comma space is space the space velocity space of space the space second space train. space

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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.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views

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. 


814 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