Yes, when you stand on the floor, it exerts an upward force against your feet known as the normal force. This force is equal in magnitude but opposite in direction to the force you apply downward on the floor due to gravity.
If your feet are off of the floor, then the chair exerts your total weight against you.
Yes, according to Newton's third law of motion, the floor exerts an equal and opposite force against your feet when you stand on it. This upward force is what supports your weight and prevents you from falling.
When going uphill, you are primarily pushing against gravity to move your body and any additional weight uphill. Additionally, you are also exerting force against any friction present between your feet and the surface you are walking or climbing on.
Force A is Gary's weight pulling him downward towards the ground. Force B is the reaction force from the ground pushing back up against Gary's feet as he rests on the ground.
You would feel a force of 140 pounds pushing back on your feet as you stand on the floor. This force is the gravitational force acting on your body due to Earth's pull. Your weight represents the force exerted by gravity on your mass.
There may not be enough friction between your feet and the floor. You need friction to be able to exert a force against the floor, to balance yourself and move in the direction you desire.
Example: Measure a floor-- it is 20 feet long and 30 feet wide 20 x 30 = 600 square feet.
One example of static electricity is when you drag your feet across the floor and then shock someone. The shock is the static electricity.
The pressure on an object increases with depth because there is more pushing on it. For example, four feet below the surface of water, there is a layer of water four feet thick pushing on the object and the water around it. Now several miles down, this layer of water is much thicker, and so exerts more pressure when it is pushing down. In this example I used water, but the same can be applied to any fluid, including air.
No, the floor does not push up at you when you stand or walk. When you stand or walk, the force exerted by your feet on the floor is equal and opposite to the force the floor exerts on you, as described by Newton's Third Law of Motion.
The floor's area is: 1,296 square feet.