General Knowledge - Physics - Discussion

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.

Two vectors never give zero.

But in the case of three, it is possible.

Consider two unequal vectors are placed on two sides of a triangle then it gives the resultant third side so it can never be zero, but if we place another vector as the third side of the triangle then the resultant will be zero.

I think the answer is 2. Definition of equal vectors is that both vectors should have the same magnitude and same direction.

For example, two vectors F and -F have the same magnitude but are in opposite direction. So they are unequal vectors. Hence the answer is 2 (option A).

Answer is three.

I agree because two unequal vectors never gives resultant zero but three unequal vectors give resultant zero.

Ex. We have three vectors N, P and L. N and P goes in same direction and L goes in opposite direction then its resultant is zero.

The Correct answer is "2". It is even approved by our physics lecturer.
Let's take an exampl: -5 and 5.

(-5 is not equal to 5, so there are 2 unequal forces)
-5+5=0.
Hence proved.

2 is the most appropriate answer.

Because vectors are equal when their magnitude and direction are equal, Hence if we put 2N force towards east and 2N force towards the west the body will remain in equilibrium.

2 vectors can never give zero resultant but 3 vectors will give it, e.g let vectors N and P with value 4 and 6 move rightward while vector T with value 10 moves leftward. Therefore, there resultant is zero (0).

Two collinear vectors can make zero resultant but they should be of same magnitude and opposite direction in same straight line. When vectors are unequal minimum number required to make zero resultant is three.

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

The answer is 3.

But, if we have one positive vector and other is negative vector so, there sum will be zero.

Hence, both will be correct.