Three forces, A, B, and C, are acting on the same object with magnitudes a, b, and c, respectively. Force A acts to the right, force B acts to the left, and force C acts downward. What is a necessary condition for the object to move straight down?

A. The magnitude of force A must be greater than the magnitude of force C, so A > C.

B. The magnitude of force A must be greater than the magnitude of force B, so a > b.

C. The magnitude of force A must be equal to the magnitude of force B, so a = b.

D. The magnitude of force C must be greater than the magnitude of forces A or B, so A < C > B.

Force is an external agent applied on any object to displace it from its position. Force is a vector quantity, so with magnitude it also requires direction. Direction is necessary to examine the effect of the force and to find the equilibrium of the force.

Now here in the question three forces, A, B, and C, are acting on the same object with magnitudes a, b, and c, respectively. Force A acts to the right, force B acts to the left, and force C acts downward.

The force C must be greater than the two forces A and B acting on the right and left side of an object, It is because the resultant of the force will move object downward if the force at C will be greater then the other two forces.

Hence the magnitude of force C must be greater than the magnitude of forces A or B, so A < C > B.

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