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sir, the dot product of two vectors(having mag and directn) comes out to be a scalar. (vector)a.(vector)b=ab cos thita the direction is lost. How? Why is so?can u explain me with a practical example?

sir,


the dot product of two vectors(having mag and directn) comes out to be a scalar.


(vector)a.(vector)b=ab cos thita


the direction is lost.


How? Why is so?can u explain me with a practical example?

Grade:11

1 Answers

Sanjeev Malik IIT BHU
101 Points
10 years ago

u r trying to understand it in back direction.

it is actually by considering practical things  ,phenomenons logics that these so called formulas n names and properties r formed.

see the example of force.

parallel component of force to the movement causes work. we see that force and displacement r vetors as we need to tell in what direction they r acting.

bt work is a quantity to measure used strength or entity to check the amount used. it has no relation with direction. just we say " itna kaam hua...."

thus w= f.s   n INCLUDES COSQ as this cos gives component of force parallel to s.

thats it.............

 

 

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