Here's why:
* Force is a vector: Force has both magnitude (how strong it is) and direction.
* Equal and opposite forces: When the forces are equal and opposite, they cancel each other out.
* Net force: The net force, or the overall force acting on the rope, is zero.
* Equilibrium: Since there's no net force, the rope remains in a state of equilibrium. It doesn't move in either direction.
Think of it like pushing against a wall. You exert a force on the wall, but the wall pushes back with an equal and opposite force. The wall doesn't budge. The same principle applies to the tug of war rope when the teams are perfectly matched.