Where is gravitational force directed as you stand on the floor?
Newton's laws of motion are three rules that define the relationship between an object's motion and the forces that operate on it. The first law specifies that unless acted upon by an external force, an object either stays at rest or moves at a steady velocity. The second law states that the rate of change of momentum of an object is directly proportional to the force applied, or that the net force on an object is equal to the mass of that object multiplied by the acceleration on an object of constant mass. The third law states that when one object exerts a force on another, the second object exerts a force on the first object that is equal in magnitude and opposite in direction.
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Answer:
Newton's third law states that every action has an equal and oposite reaction. You may not think this, but when you're standing ont he floor, you are excerting a force against the floor: your weight, caused by gravity, is pulling you down.