Usually more than one force pushes or pulls on something at once — and what matters is who wins. Think of a tug-of-war:

• If both teams pull equally, the forces are balanced and the flag doesn't move.
• If one team pulls harder, the forces are unbalanced: there's a leftover force — the resultant — and the flag moves that way.

A balanced tug-of-war and a flag sitting on a table are the same idea: lots of forces, but they cancel out, so nothing moves.

Set each team's pull. When they're equal the flag stays put — balanced. Make one bigger and a purple leftover force appears, dragging the flag towards the winning side.