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When a body is subjected to two forces, the body will be in equilibrium if the two forces are:

When a body is subjected to two forces, the body will be in equilibrium if the two forces are: Correct Answer collinear, equal and opposite

Explanation:

Principles of equilibrium

1. Two force principle: If only two forces act on a body that is in equilibrium, then they must be equal in magnitude, co-linear and opposite in sense.

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2. Three force principle: If a body in equilibrium is acted upon by three forces, then the resultant of any two forces must be equal, opposite and collinear with the third force. If a three-force member is in equilibrium and the forces are not parallel, they must be concurrent. Therefore, the lines of action of all three forces acting on such a member must intersect at a common point; any single force is, therefore, the equilibrant of the other two forces.

If it does not pass through a common point, it will produce a couple.

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A solid body applied to three forces whose lines of action are not parallel, is in equilibrium if the three following conditions satisfies:

  1. The lines of action are coplanar (in the same plane).
  2. The lines of action are meeting at a point.
  3. The vector sum of these forces is equal to the zero vector.
3. Four force principle: If a body in equilibrium is acted upon by four forces, then the resultant of any two forces must be equal, opposite and collinear with the resultant of the other two forces.

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