Newton's Fundamental Laws??!?

Question

1. If Earth pulls you down, then according to Newton's third law, you pull Earth up. Is this possible? (Remember that F=ma for each object.)
2. When you are standing on the floor, you push down on the floor and the floor pushes back on you. Why doesn't the floor make you rise up?

Answer 1

1. If those forces were not exactly equal, you would either float away or be sucked into the earth.
2. That is because the force that exert on the floor is exactly equal to the force that floor exerts upon you. If the floor puched up harder, you would rise; if you pushed down more, you would sink into the floor. SInce you stand there, the forces must be equal.

Answer 2

1. Yes, you pull the Earth up, but the Earth is so much more massive than you, so it wins.

2. You don't rise up because the floor's "pushing up" is better thought of as an act of support. It pushes up with the same force that you push down with. If the floor was not capable of pushing up with equal force, you would collapse the floor.

Answer 3

1. And that is absolutely correct but since the mass of the earth is much larger you only "detect" the displacement of your body and not of the Earth itself with respect to the centre of mass of the system body-Earth

2. Because the 2 forces you mentioned are equal in magnitude and opposite in direction and so balance each other in such a way that their resultant is zero. Therefore effectively no force acts on you!

Answer 4

Well: it would be called the "Laws of Gravity where it
has been studied with N.A.SA experiments like using
G -Force"