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A body remains in equilibrium if ________

(a) Inertia force is applied in the same direction to the resultant force

(b) Inertia force is applied in the direction opposite to the resultant force

(c) Inertia force is applied in the direction Perpendicular to the resultant force

(d) Inertia force is applied in the direction Parallel to the resultant force

This question was addressed to me in class test.

I'm obligated to ask this question of Resultant Effect of a System of Forces Acting on a Rigid Body in portion Inertia Forces in Reciprocating Parts of Machine Dynamics

1 Answer

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by (38.6k points)
Right answer is (b) Inertia force is applied in the direction opposite to the resultant force

Explanation: Inertia force is an imaginary force which tends to act in the direction opposite to the resultant force to bring the body in equilibrium. Numerically it is equal to the magnitude of accelerating force.

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