Answer :
The net force acting on the metal disk is equal to 1 Newton.
According to the third law of motion proposed by newton,
Each and every action of force has an equal and opposite reaction force.
This reaction force will be equal in magnitude of the action force but will be in the opposite direction.
So, here in this case, the metal disk is balanced on the top of the glass.
The metal disk is applying a force of one Newton on the glass. So, the glass will also apply an equal force on the metal disk,
This net force working on the disk is called the normal force, so the net force on the metal disk is 1 Newton.
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