- #1

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How can we prove that the forces acting on a body can form a closed-up polygon?

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- #1

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How can we prove that the forces acting on a body can form a closed-up polygon?

- #2

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If they didn't, then there would be a resultant force. The magnitude of the resultant is zero only if the other forces form a closed polygon. The condition for equilibrium is, of course, no net force

- #3

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If there are no forces or only two forces on the object then that object could be in equilibrium but the force vectors can't be connected to form a polygon.

- #4

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Well you could think of the two forces case as going along a line and back along the same line.

The idea to remember is that the sum of the force vectors is a zero vector for the object in equilibrium.

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