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Which of the following correctly defines coplanar force?

  • A.When the lines of the action of all forces lie in one plane.
  • B.Two or more than two forces acting at a point.
  • C.A single force, which acting along with other forces, keeps the body in equilibrium.
  • D.A single force which produces the same effect as that produced by two or more forces acting on the body.

Answer: A

Coplanar forces are forces whose lines of action all lie in one plane, which is the first option. Forces acting at a single point are concurrent forces, a single force that keeps the body in equilibrium together with other forces is the equilibrant, and a single force that produces the same effect as two or more forces is the resultant. So the other three options define different terms. In coplanar force systems all the forces can be shown on a flat drawing, and this is the common case in statics problems.

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