Answer
We can consider the system consisting of both teams and the rope. The friction from the ground exerts horizontal forces on the system. Whichever team is able to push harder on the ground horizontally will be able to get the ground to exert a larger force horizontally on the system, thus allowing them to win the contest.
Work Step by Step
We can consider the system consisting of both teams and the rope. The friction from the ground exerts horizontal forces on the system. Whichever team is able to push harder on the ground horizontally will be able to get the ground to exert a larger force horizontally on the system, thus allowing them to win the contest.