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Normal gravity refers to the acceleration due to gravity at the Earth's surface, which is approximately 9.81 meters per second squared. This value is used as a standard reference in various fields, such as engineering and physics, for calculating forces and weights.
The opposite reaction pair to gravity is the normal force.
The force that supports an object against gravity is called the normal force. It is exerted by a surface to prevent objects from falling through it. The normal force equals the force of gravity acting on the object.
The equation for calculating the normal force acting on an object is: Normal force mass x gravity.
Other common names for the normal force that opposes gravity are support force, contact force, and reaction force.
The gravity acting on the picture is balanced by the normal force from the shelf. This normal force essentially "supports" the picture, preventing it from falling due to gravity. If the forces were unbalanced, the picture would indeed fall due to gravity.