An example of a balanced force would be a computer on a desk. Since the force of gravity is equal to the force the table is pushing up, the computer isn't moving. If gravity was greater, then the computer would o through the desk. And if the force pushing up by the table was greater, then the computer would be floating in the air.
Like hannah, tug of war is a good example of an unbalanced force. If an adult is pulling the rope from a child, then he has a greater force than the child, resulting in an unbalanced force.
Below shows balanced and unbalanced force.
Balanced Force: 10 N <-------- and --------> 10 N
Unbalanced Force: 10 N <------- and -------------> 20 N