Yes, the force exerted by the floor on our feet is equal to the force that our feet exerted on the floor, or it just depends on your weight, If you are heavier than the normal. When you stand, the longer the time you stand, the more pain you feel on your feet. And we can't be move upward by the force that the floor exerted on our feet because of the force of our weight that keeps us on the ground, and also because of gravity.
opposite and equal force against you.
Because your feet are not accelerating, the force exerted by the floor upon your feet must be exactly the same as the force exerted by your feet on the floor. If you are standing, the amount of force exerted by your feet, and thus the amount of force exerted by the floor, is equivalent to your weight.
Yes
Since your weight remains constant, the only variable is the area. Pressure is the ratio of Force to Area, implying that the larger the area the smaller the pressure and vice versa. Since lying down translate into occupying a larger area than when standing up, a lower pressure is exerted on the floor while lying compared to when standing on the floor.
If you are behind a car, about to push it forward from a resting position, you will need to exert a force on the car to accelerate it from resting position. While you are pushing against the car, however, there will be a reaction force pushing back at you. In order to produce a large net force against the car without being pushed backward yourself, you need to increase the friction of your feet against the ground...so that the frictional force between your feet and the ground prevents you from sliding backward. The combinations of the frictional force and your force pushing forward against the car will cause the car to move forward. The frictional force of the car being moved from resting position also has to be overcome, of course.
opposite and equal force against you.
Because your feet are not accelerating, the force exerted by the floor upon your feet must be exactly the same as the force exerted by your feet on the floor. If you are standing, the amount of force exerted by your feet, and thus the amount of force exerted by the floor, is equivalent to your weight.
The force that your legs exert to create forward momentum.
normal force
in which situation you exert more force downward, standing or lying horizantilly?
Muscular strength
Yes
Rockets exert force at the upper part of the combustion chamber. This pushes the rocket forward.
Both a balloon and jet engine exert force in the backward direction to move forward.
Newton's 3rd law of motion states is basic terms that for every action there is an equal, but opposite reaction (if you push against a wall with force F, then the wall will push back with force -F). When you walk/run forward, you exert a force on the ground that goes diagonally down and backward. The equal, but opposite reaction is the ground exerting a force on your foot that is diagonally up and forward (exactly opposite that applied by your foot). This helps to propel you forward as you walk or run.
Third, for every action there is an equal and opposite reaction, you exert force on the paddle and the paddle exerts the same force on the water to propel you forward.
Since your weight remains constant, the only variable is the area. Pressure is the ratio of Force to Area, implying that the larger the area the smaller the pressure and vice versa. Since lying down translate into occupying a larger area than when standing up, a lower pressure is exerted on the floor while lying compared to when standing on the floor.