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Physics Part I

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Class 10 Class 12

Two buses started simultaneously towards each other from towns A and B which are 480 km apart. It took the first bus travelling from A to B eight hours to cover the distance and the second bus travelling from B to A, ten hours. Determine when the buses will meet after starting and at what distance from A. 

Here, distance between two towns A and B, S = 480 km 

v1 = S/8   and
v2 = S/10

If these buses meet after time t,  then 

S/8 x t + S/10 x t = S 

On solving, we get 

t = 40/9 hours 

Therefore, distance from A = 480/80 x 40/9 = 800/3 = 266.7 km 


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 scalar quantities.

Mass, temperature and energy

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 vector quantities.

Force, impulse and momentum.

What is a scalar quantity?

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