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Physics Part I

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Class 10 Class 12
A body is projected with velocity u at angle θ with horizontal. Write the expression for the path followed by body.

Velocity with which the body is projected = u 

Angle made by the body with horizontal = straight theta 

The equation of trajectory is given by, 

               straight y equals straight x space tanθ minus 1 half straight g fraction numerator straight x squared over denominator straight u squared cos squared straight theta end fraction

This is an equation of a parabole, hence the path of projectile projected at some angle with the horizontal direction from the ground is a parabolic path. 


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.

Give three examples of vector quantities.

Force, impulse and momentum.