General Knowledge - Physics - Discussion
Discussion Forum : Physics - Section 1 (Q.No. 76)
76.
Minimum number of unequal vectors which can give zero resultant are
Discussion:
23 comments Page 3 of 3.
Dipendra said:
1 decade ago
Yes in case of b two vectors combine with each other to give a resultant vector which is equal and opposite to third vector.
Ramesh said:
1 decade ago
Answer is Three
One is obviously out. Two is out because if two unequal forces n and p act on an object the resultant with the minimum force in magnitude is |n - p|, which will never be 0 if n =/= p.
Three can be easily resolved with a quick example. Imagine an object with three concurrent forces acting on it.
Two forces, n = 3 N and p = 4 N, create an angle with eachother such that the resultant is 5 N. 180 degrees from the resultant, a force, r = 5 N, is acting on the object.
Thus three unequal vectors on an object can result in 0.
One is obviously out. Two is out because if two unequal forces n and p act on an object the resultant with the minimum force in magnitude is |n - p|, which will never be 0 if n =/= p.
Three can be easily resolved with a quick example. Imagine an object with three concurrent forces acting on it.
Two forces, n = 3 N and p = 4 N, create an angle with eachother such that the resultant is 5 N. 180 degrees from the resultant, a force, r = 5 N, is acting on the object.
Thus three unequal vectors on an object can result in 0.
Zaigham Feroz (Pakistan) said:
1 decade ago
CORRECT OPTION is option (A) not (B)
We know
A and -A are unequal vectors, they give zero resultant when added.
hence minimum number of vectors is 2
We know
A and -A are unequal vectors, they give zero resultant when added.
hence minimum number of vectors is 2
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