Question
The lengths of members BC and CE in the frame shown in the figure are equal. All the members are rigid and lightweight, and the friction at the joints is negligible. Two forces of magnitude 𝑄 > 0 are applied as shown, each at the mid-length of the respective member on which it acts.
Which one or more of the following members do not carry any load (force)?
Options :
AB
CD
EF
GH
Answer :
GH
Solution :
If at a joint three-member meet out of which two are collinear then the force in the third member will be zero provided there is no load or reaction at the joint.
FGH = 0
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