Why is the earth attractive? How attractive is the earth to people

Any two objects in the universe, from celestial bodies to dust, have a force that attracts each other, so all objects on the earth are attracted by the earth. And because the forces between objects are reciprocal, we are actually attracted to the earth.

As for why the earth is attractive, because of gravity, the earth itself has mass, and objects on the earth, as long as they have mass, will be attracted to the earth. It's like why the earth always revolves around the sun. The mass of celestial bodies is very large, and the gravitational pull between them is very large.

Gravitational forces bind the Earth and other planets to the solar system, orbiting the sun.

According to the law of gravitation, the attraction of the earth to people f=gmm r 2

Without counting the rotation of the earth, the attraction of the earth to man is equal to the gravitational force of man. The gravitational force on a person with a mass of 60kg g=mg=

Gravitation is an interaction between objects due to the mass they have. Its size is related to the mass of the object and the distance between the two objects. The greater the mass of the object, the greater the gravitational pull between them; The farther apart the objects, the less gravitational pull there is between them.

The gravitational force between two objects that can be regarded as particles can be calculated using the following formula: f gmm r 2, i.e.

The gravitational force is equal to the gravitational constant multiplied by the product of the masses of the two objects divided by the square of their distances. where g represents the gravitational constant, which has a value of about minus 11 units.

n·m2/kg2。for British scientists.

Cavendish was measured by a torsion scale experiment.

Derivation of gravitation: If the orbit of the planet is approximately circular, the angular velocity of the planet's motion can be determined from Kepler's second law, i.e.,

2 t (cycle).

If the mass of the planet is m, the distance from the Sun is r, and the period is t, then the magnitude of the force on the planet is .

mrω^2=mr（4π^2）/t^2

In addition, it can be obtained from Kepler's third law.

r3 t 2 = constant k'

Then the force along the direction of the sun is.

mr（4π^2）/t^2=mk'（4π^2）/r^2

From the relationship between the action and reaction forces, it can be seen that the sun is also subjected to the same magnitude of the above-mentioned forces. From the perspective of the Sun, (the mass of the Sun m)(k''）4π^2）/r^2

It is the sun that experiences a force in the direction of the planets. Since they are forces of the same magnitude, it can be seen from the comparison of these two equations that k'contains the mass of the Sun m,k''contains the mass m of the planet. From this, it can be seen that these two forces are proportional to the product of the masses of the two celestial bodies, which is called gravitational force.

If a new constant (called the gravitation constant) is introduced, and the masses of the Sun and the planets are considered, as well as the previously derived 4· 2, then it can be expressed as.

Gravitational force = (gmm) (r 2).

The gravitational force between two normally objects is so small that we don't perceive it and can ignore it. For example, if two people with a mass of 60 kilograms are meters apart, the gravitational force between them is less than one millionth of a newton, and an ant drags a stalk of grass with 1,000 times the force of this gravitational force! However, in the celestial system, gravitational attraction plays a decisive role due to the large mass of the celestial body.

The Earth, which is still relatively small in the mass of celestial bodies, already has a huge effect on the gravitational pull of other objects, it binds humans, the atmosphere and all terrestrial objects to the Earth, and it makes the Moon and artificial Earth satellites revolve around the Earth without leaving.