In the case above, the sum of forces on node 2 (upper-left) is said to be zero.
What is net force?
If any object is said to be falling at constant speed. The net force is often known to be zero.
in the case above, you see that 2 and 3 node is falling down therefore, node 1 and 4 will be zero.
So, In the case above, the sum of forces on node 2 (upper-left) is said to be zero.
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