What causes the normal force?

Question

What causes the normal force in physics?

Answer 1

Gravity.
The normal force is the force something exerts on something else because gravity is pulling it down onto it.
For example, a box on a table top. The box is exerting its weight upon the table top as W= -mg (Negative because it is a downward force against the table). By Newton's second law the table is exerting the same force in return. This is the normal force - the opposite of the weight. N = mg (no negative because it is upward, against the box).

Answer 2

In physics, the normal force Fn (or in some books N) is the component, perpendicular to the surface of contact, of the contact force exerted by, for example, the surface of a floor or wall, on an object, preventing the object from entering the floor or wall. In a static situation it is just enough to balance the force with which the object pushes, e.g. its weight on the floor, or a smaller force if somebody leans against a wall. If an object hits the surface with some speed, the normal force provides for a rapid deceleration, depending on how flexible the floor/wall is (and, of course, if it can provide enough force instead of breaking). Also, if the object is soft, only the outer part needs to decelerate rapidly, the inner part can do that more gradually, while the layer in between is compressed.

Note that the sign of the calculated value will be either positive or negative depending upon whether the positive y-axis is taken to be either positive or negative.

In general, the magnitude of the normal force is the projection of the surface traction, T, in the normal direction, n, and so the normal force vector can be found by scaling the normal direction by that force. The surface traction, in turn, is equal to the dot product of the unit normal with the stress tensor describing the stress state of the surface.

Answer 3

What Causes Force

Answer 4

The normal force is caused by the force exerted by the surface upon which an object is. It is always exerted perpendicular to and away from the surface upon which the object is on, and it is always equal to the force which pulls the object in the opposite direction; that is, either the force of gravity (on a level surface) or the vertical component of gravity alone(on an incline). If the object is on a level surface, the normal force equals the force of gravity. If on an incline, it equals the force of gravity times the cosine of the angle of the incline. The normal force is the equal and opposite force produced due to the object's exertion of its weight on the surface of the object.

The normal force is in keeping with Newton's third law: every action produces an equal and opposite reaction. Therefore, if an object exerts a force upon a surface, then the same force is exerted upon the object in the opposite direction. When an object is on a surface, the force that it exerts is the force of gravity, or mg, which is the mass of the object multiplied by the acceleration due to gravity. The equal and opposite force that is exerted by the surface upon the object is called the normal force.

Answer 5

Basically it is perpendicular reaction to the acting force. For example if 40 kg object resting upon a table, the normal force on the object is equal but in opposite direction to the gravitational force applied on the object i.e. the weight of the object. In this case the normal force is given by, 40 kg · 9.81 m/s2=390 newtons where 9.81 m/s2 is equal to the acceleration due to gravity (near the Earth's surface).

Answer 6

Normal force is due to the newtons third law .
For every action there is a reaction.

Answer 7

The normal force is cause by gravity. That is why in the space this normal force is not present becasue Gravity is ZERO.
I hope this helps.

Answer 8

Hi. Gravity and friction.

Answer 9

what couse force