"The Third Law, as you may recall, is “for every action, there is an equal and opposite reaction.” When I sit on a chair, I exert downward force on the chair. That is an action. The chain exerts an equal and opposite upward force. And I am suspended in air. Physics."
Actually not true. The Earth exerts a gravitational force on you, and you exert an equal gravitational force on the Earth. Those are the paired forces that make up the Third Law in this case. The forces between you and the chair are reaction forces that arise because of the mutual attraction between you and the Earth. Sorry to be a pedantic physics nerd!
"The Third Law, as you may recall, is “for every action, there is an equal and opposite reaction.” When I sit on a chair, I exert downward force on the chair. That is an action. The chain exerts an equal and opposite upward force. And I am suspended in air. Physics."
Actually not true. The Earth exerts a gravitational force on you, and you exert an equal gravitational force on the Earth. Those are the paired forces that make up the Third Law in this case. The forces between you and the chair are reaction forces that arise because of the mutual attraction between you and the Earth. Sorry to be a pedantic physics nerd!