Why can t it be said that gravity is perpendicular downwards

The direction of gravity is towards the center of the earth, not vertically downward, but vertically downward, for example, an object on an inclined plane is supported by an inclined plane, which is the pressure on the inclined body on a perpendicular inclined plane, and gravity is vertically downward.

Perpendicular is relative to the other face. If you have to say vertical, you have to say that gravity is perpendicular to the horizontal and facing downward! Simply talking about vertical, perpendicular to whom? Is it perpendicular to the inclined plane? That's wrong! So it's straight down.

Because: the earth has to rotate, so objects on the ground need a centripetal force to maintain this state. The centripetal force is a component of the gravitational force, and the other component of the gravitational force is gravity.

In other words, one part of the gravitational force is used to provide the centripetal force, and the other part is the gravitational force.

Since the force here is a synthesis of vectors, the gravitational force is directed towards the center of the earth, and the centripetal force is perpendicular to the earth's axis, so the gravitational force is not collinear with the gravitational force, i.e., it is not directed towards the center of the earth.

Because gravity is a component of gravitational force. The gravitational force is the one that is vertically downward. Gravity should be a little off

Verticality must have a relative, that is, perpendicular to what, and gravity perpendicular to what? With the ground? There are also bumps in the ground.

It should be straight down.

If it is on an inclined plane, then vertical downward means perpendicular to the inclined plane.

Categories: Education Academic Exams >> Gaokao.

Problem Description: The following statement is true ( ab ).

a. Whether it is a solid, liquid, or gaseous cavity, it is subject to gravity.

b. The direction of gravity is vertically and horizontally facing downward.

c. People still fall back to the ground after jumping, indicating that there is a gravitational force between people and the earth; The fact that an artificial satellite can orbit the Earth in a stable orbit means that it is not affected by the Earth's gravity.

d. People all live on the earth, so the gravitational pull of the earth on everyone is the same.

Analysis: It is right to choose envy ab.

The landlord has questions about item b, and there is nothing wrong with it. The direction of gravity is perpendicular to the horizontal side facing downward. The horizontal plane refers to the broad ground plane.

Wrong. The direction of gravity is always straight down, not vertically downward. The direction of gravity is perpendicular to the horizontal combustion side downward, also known as vertical downward, and the support surface is not necessarily horizontal, so the direction of this force cannot be said to be vertical downward.

The square roll of gravity is always straight downward. Vertical source downward refers to the direction that is perpendicular to the horizontal plane where the object is located. It should be noted that there is a difference between "vertical down" and "vertical down", and "vertical down" means perpendicular to a plane downward.

The direction of gravity is always straight downward, and the reasons why we don't say "vertically downward" are as follows.

1) Since gravity is a force due to gravity, its direction is always directed towards the center of the earth;

2) The Earth is approximately spherical, and the direction of gravity at any position on the surface of the Earth is directed towards the center of the Earth, which can also be said to be vertically downward in terms of position;

3) The concept of perpendicular should have its vertical plane, and in terms of position, the ground is not necessarily flat, so it is not scientific to say that it is vertical downward.

The direction of gravity is vertically downward, not vertically downward, which is wrong

So the answer is:

When we say that the direction of gravity is really downward, it does not mean that there is a horizon line in the universe and then all of them are pointed vertically to this horizon.

The vertical downward direction is different in different parts of the earth.

Gravity is only a part of the gravitational force f between the object and the earth, and there is a saying that it is the resultant force of the gravitational force f and the centripetal force on the object m.

The gravitational force points to the center of the earth, and gravity only deviates slightly from the center of the earth under the action of centrifugal force. Only the poles point to the center of the earth.

The gravitational force that we humans experience is directed towards the center of the earth, and although gravity is slightly off, it is similar to a sphere because the earth.

So this force is almost perpendicular to the tangent direction of the ball we are on.

Because the earth is very large, this tangent direction can be seen as the horizon of our location.

And gravity is almost perpendicular to it.

So it's straight down.

Vertical downward is perpendicular to the horizontal downward face, that is, the direction where the line is located when the object is suspended with a line, and the water surface at rest represents the horizontal plane, note: except for the north and south poles and the equator, the vertical downward does not point to the center of the earth.

The force exerted on an object due to the attraction of the earth is called gravity. The object of gravity is the Earth.

The direction of gravity is always straight downwards. The gravitational force experienced by the object is proportional to the mass of the object, and the calculation formula is: g=mg, g is the proportionality factor, the magnitude is about, the gravitational force changes with the change of latitude, and the gravitational force of an object with a mass of 1kg is.

The point at which gravity acts on an object is called the center of gravity.

The magnitude of gravity can be measured with a dynamometer, and the tension or pressure of a stationary or uniform linear moving object on the dynamometer is equal to the magnitude of gravity.

The gravitational force exerted on a ground object is only a manifestation of the gravitational pull near the earth's surface.

The gravitational force on the same object can vary under different circumstances, and when it is greater than the normal value, it is called overweight, and when it is less than the normal value, it is called weightlessness.

The force exerted on an object due to the attraction of the earth is called gravity. The direction is always straight downwards and is not necessarily directed towards the center of the earth (only at the equator and the poles point to the center of the earth). The gravitational force of the object at the same point on the ground is proportional to the mass m of the object, and similarly, when m is constant, the gravitational force of the object is proportional to the acceleration of gravity g, which is expressed by the relation g=mg.

Usually near the earth's surface, the g value is about, which means that the gravitational force experienced by an object with a mass of 1kg is. (is an average; At the equator, g is the smallest, g=; At the poles g is maximum, g = . n is the unit of force, the letters are denoted as n, and 1n is about the force to pick up two eggs).

Gravity is not equal to the gravitational pull of the Earth on an object. Due to the rotation of the earth itself, in addition to the poles, the objects in other places on the ground are together with the earth, around the earth's axis to do approximately uniform circular motion, this balance needs to have a centripetal force perpendicular to the earth's axis, this centripetal force can only be provided by the earth's gravitational force on the object, we can decompose the earth's gravitational force on the object into two components, one component f1, the direction points to the earth's axis, the magnitude is equal to the centripetal force required for the object to move around the earth's axis in an approximate uniform circular motion; The other component, g, is the gravitational force on the object.

where f1 = mrw 2 (w is the angular velocity of the earth's rotation and r is the radius of rotation of the object), it can be seen that the magnitude of f1 is zero at the poles, increases with the decrease of latitude, and is the maximum f1max in the equatorial region. Since the centripetal force of an object is very small, in general, it can be approximated that the gravitational force of the object is equal to the gravitational force, that is, in general, the influence of the rotation of the earth can be omitted. where the gravitational component of gravity provides gravitational acceleration and the centripetal component of gravity provides centripetal acceleration that maintains rotation with the earth.

Vertical is a kind of specific reference: the direction of gravity is defined as the direction of gravity, and if the rotation of the earth is not considered, we define the direction of gravitational force - the direction along the radius of the earth to the center of the sphere, as the vertical downward direction.

Perpendicular is a relative orientation, and for one direction, if the other direction is perpendicular to it, we call it perpendicular, so perpendicular is not related to upward and downward direction. And vertical can be said to be straight down or straight up.

A rope hangs a heavy object, and when it is stationary, the downward direction of the line is vertically downward.

When a chair is placed on an inclined plane, the legs of the chair are vertically beveled, which is called vertical downward, but it is obviously not the vertical downward of the front.

The direction of gravity is pointing vertically towards the center of the earth rather than perpendicular to the ground downward.

It's either vertically down, vertically up, or down...... in some other direction