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For applying the method of joint at joints the forces need to coplanar.

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For applying the method of joint at joints the forces need to coplanar.

(a) False

(b) True

This question was addressed to me in an international level competition.

This question is from Method of Joints in chapter Structural Analysis of Engineering Mechanics

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Correct choice is (b) True

Easiest explanation: The forces are coplanar that’s why they are there in the calculations in the method of joints. The forces are resolved in 2D. This makes the condition of the equilibrium fulfilled and hence the method of joints uses the forces in the same plane for its calculation.

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