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Number of zero force members in the truss subjected to a force as shown in the figure is:

Number of zero force members in the truss subjected to a force as shown in the figure is: Correct Answer 2

Concept:

Rule for zero member force:

  • At a joint, if three members are meeting, two members are collinear (same line), then force in the third member is always zero (if there is no external load at that joint)
  • At a joint, if two non-collinear members are meeting with no external load at that joint then forces in both members will be zero.

Calculation:

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(i) At joint C, we get member CB to have zero force member as the load is acting in the horizontal direction and no load is in the direction of CB.

(ii) Joints A and B do not move relative to each other i.e. member AB has no change length

⇒ No strain ⇒ zero Force

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