a) When the forces acting on a body is zero, the forces are called balanced force. Pressing of a balloon between both the hands is an example of balanced force.
When the forces acting on a body is not zero, the forces are called unbalanced force. Pushing a toy car is an example of unbalanced force in which the car starts to move as there is unbalanced force acting on it.
b) When a rubber ball is pressed between our hands, balanced force acts on it and therefore, there is no change in its shape.
