When a cup is placed on a table, the table exerts an equal and opposite reaction force on the cup to support its weight.
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When pulling an object on a table, the reaction force will be equal and opposite to the pulling force exerted on the object. When pushing an object on a table, the reaction force will be equal and opposite to the pushing force exerted on the object. In both cases, the table exerts a reaction force to prevent the object from moving.
The reaction force when you place a cup on a table is the force exerted by the table on the cup in the opposite direction to the force applied by the cup on the table. This force prevents the cup from falling through the table and keeps it in place.
An example of balanced forces acting on a static object is when a book is placed on a table. The force of gravity pulling the book downward is balanced by the normal force exerted by the table, keeping the book in place.
The normal force exerted by the table on a block at rest is equal in magnitude but opposite in direction to the downward force applied to the block.
The force of gravity pushes the cup downwards towards the ground, while the normal force exerted by the table on the cup pushes upwards, balancing out the force of gravity and preventing the cup from falling.