Here is an example in which the normal force would not be counted as an action-reaction pair. A 100g block is sitting at rest on a horizontal table. According to Newton's third law, which of the following indicates the correct action-reaction pair of the two forces? So I was stuck between C. The weight of the block and the normal force exerted by the table on the block and D. the weight of the block and the gravitational force exerted by the block on Earth. The correct answer in my text book was D. It's pretty weird. Why is there no action reaction pair for the normal force?