When a boy is chasing a ball, there are two main forces acting on the boy:
1. The force of gravity pulling the boy down towards the ground.
2. The force of the boy's muscles pushing him forward.
In order for the boy to maintain a constant speed, these two forces must be equal in magnitude and opposite in direction. However, as the boy is chasing the ball, he is constantly changing speed and direction, which means that the forces acting on him are also constantly changing. Therefore, the boy chasing the ball is not an example of balanced force.
