Because it is balanced by an elastic force due to the compression in the shelf.
If the net force is zero, then the forces are balanced. If the net force is not zero, then the forces are not balanced. You can have a balanced pair of forces, but not a pair of balanced forces.
A balanced force is either not moving or at a constant velocity
When several forces act on a body and the result of the force is zero it is considered to be balanced force.
It is balanced when there is no consequential motion (example: pushing against a wall). In that case the reaction of whatever is receiving the force exactly equals it, in the opposed direction. If there is consequential motion, the force is said to be unbalanced, with an acceleration occurring of force/mass. D'Alembert pointed out that even in that case, the quantity "F-ma" is zero, leading to D'Alermbert's Principle, that if a force causes an acceleration, then it can be said that the force F is precisely balanced by a fictitious force of magnitude m.a in a direction opposite to the acceleration, so the system can be solved as if a static problem.
magnetic force
in many cases when it is not balanced or like in case of wall we apply force and we get equal and opposite force in return
balanced force is when things are balanced.
Gravity pulls the picture downward, but tension pulls the picture upward toward the nail. The forces are balanced, so the framed picture does not move.
Because it is balanced by an elastic force due to the compression in the shelf.
A balanced force will have a net force that is equal to 0. A balanced force will have an opposing force of equal magnitude of the largest force.
The force that is stronger will overwhelm the other force and the other force will lose it's power and the vector becomes 0. Later the object gets moved or breaks. it's Shown by this formula which Newton made called F=-F. Lets say that you are pushing a wall. You are pushing the wall, but the wall pushes back as the same force as you, but if you push stronger than the maximum force of the wall, the wall breaks or moves.
The force of gravity, weight = mg.
A balanced force has a net force of zero.
-- "Inertia" is not a force. -- There is no such thing as a single balanced force or a single unbalanced force.
If the net force is zero, then the forces are balanced. If the net force is not zero, then the forces are not balanced. You can have a balanced pair of forces, but not a pair of balanced forces.
The picture frame looked askew on the wall, needing to be straightened for a balanced appearance.