Question

Following sets of three forces act on a body. Whose resultant cannot be zero?

Options

• 10, 10, 10

• 10, 10, 20

• 10, 20, 23

• 10, 20, 40

Answer 1

10, 20, 23

Explanation:

(D) Resultant of forces will be zero when they can be represented by the sides of a triangle taken in same order. In such a case, the sum of the two smaller sides of the triangle is more than the third side.

Only in option (D), sum of the first two forces is smaller than third force, thus not forming a possible triangle.