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Children on seesaw
When two children are balanced on a seesaw, the total force on the system is zero (seesaw + children). If one child then sllides toward the other, does the sum of the forces remain zero?
Customer support service by UserEcho
The reason the forces are balanced initially (before having the child move closer) is because the mass of one child caused an upward force on the other side. On the other hand, when one of them comes closer it causes an imbalance to happen because one of the child is closer. Thus, the answer to your question is no. The sum of the forces does not remain zero.