Question

The figure shows a pin-jointed plane truss loaded at the point M by hanging a mass of 100 kg. The member LN of the truss is subjected to a load of

• A. 0 Newton
• B. 490 Newtons in Compression
• C. 981 Newtons in Compression
• D. 981 Newtons in tension

Answer 1

The correct option is A 0 Newton


$\Sigma F_H=0$ & $\Sigma F_V=0$

At joint "L"

$\therefore F_{LK}-F_{LM}=0(\Sigma F_H=0)$

$F_{LN}=0(\Sigma F_V=0)$

Hence no force is acting on the truss number LN.