A man of mass 60 Kg is standing on the floor holding a stone weighing 40 N. What is the force with which the floor is pushing him up?
The gravitational pull on the man = Mg = 60×10= 600N The weight he is carrying = 40 N The total downward force on the floor = 40 N + 600 N = 640 N The Gravitational force and upward force of the floor is an action – reaction pair. The force with which the floor pushes the man = 640 N.
Newton's law of action reaction
