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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?
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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