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Motion in A Plane

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Physics Part I

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Class 10 Class 12
Why the electrons in beam from an electron gun do not fall as much as a water molecule in stream from a hose due to gravity?

Vertical distance by which projectile falls while travelling a given distance in horizontal direction is, 

                      space space straight y equals 1 half straight g straight x squared over straight u squared 

From the above relation, straight y proportional to space 1 divided by straight u squared. 

Velocity of electron from electron gun is greater than the water molecule from hose. Therefore, for a given horizontal displacement x, the vertical distance by which the electron beam falls is less than that for water molecule. 

Give three examples of vector quantities.

Force, impulse and momentum.

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. 


Give three examples of scalar quantities.

Mass, temperature and energy

What is a scalar quantity?

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

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.