If the sun has gravity, isn t it sucked by the sun? 40

Because the earth revolves around the sun, the gravitational pull of the sun provides the centripetal force of the earth's rotation, so that the earth always moves around the sun. Without the gravitational pull of the Sun, the Earth's trajectory would have been a straight line (Newton's first law).

I drew a few diagrams, in which the great circle is the sun, the black dot is the earth, and the black line represents the velocity (which can be understood more vividly). The one pointing towards the Sun indicates the setting (because the Sun's gravitational pull causes the Earth to fall towards the Sun), the one perpendicular to the falling velocity represents the Earth's speed (because the Earth moves forward in orbit), and the two are combined to form the third black line for the actual velocity (which means that the Earth does not fall on the Sun). Take a look, and if you don't understand, ask again.

a.The gravitational pull of the sun on the earth is not strong enough.

b.The gravitational pull of the earth of the sun team and the gravitational pull of the sun of the earth team, the two forces balance each other.

c.The net force of the gravitational pull of the Sun Team Earth and the gravitational force of the Solar System Force on the Earth is 0dThe gravitational pull of the Sun Team Earth constantly changes the direction of the Earth's motion, causing the Earth to orbit the Sun

The gravitational pull of the Sun Team Earth constantly changes the direction of the Earth's motion, causing the Earth to orbit the Sun.

The gravitational force is inversely proportional to the square of the distance, i.e., f=gmm r 2 and according to the centripetal force formula mv 2 r, it can be concluded that as long as the gravitational force is less than 357600000000000000000000 Newtons, the earth will not be sucked by the sun.

If you use the gravitational formula f=gmm r 2, you will calculate the actual gravitational force as.

35155474577600000000000 Newton - surprisingly close.

There is an experiment where the water in the bucket is rotated with a rope that connects the keg, and the rope is like gravity, and the force of rotation is like centrifugal force, so the two forces support the balance.

Water does not spill the earth and is not sucked in by the sun.

The watchtower owner.

The formula for calculating gravitational force is: f=gmm (r 2).

The gravitational pull between us and the sun is very small.

The Earth can create a centrifugal force through its revolution that counteracts the attraction of the Sun.

Because there is not only gravity but also repulsion between the sun and the earth, it is this repulsion that ensures that the earth can not be completely controlled by the sun and will not be attracted to it.

Because the movement of the earth around the sun will have a centrifugal force, and the centrifugal force will exactly cancel out the attraction of the sun, so it cannot attract the earth to it.

Because the Earth is also affected by other forces, not only the gravitational pull of the Sun, it does not suck the Earth over.

That's because the Earth also has gravity, so there should be a relatively stable state between the two gravitational forces.

The sun has a gravitational pull. The reason why the gravitational pull of the sun is high is because the mass of the sun is large, according to the formula of gravitational force, the greater the mass, the greater the gravitational force, and the mass and gravitational force are directly proportional. The mass of the sun in the entire solar system, the mass of stars in the universe is calculated based on the mass of the sun, and the sun is the basic unit of measurement.

Due to the strong gravitational pull of the sun, the other planets orbit the sun, although the sun has a great gravitational pull, but it cannot drive the entire solar system to move. There is not only one force in the universe, such as gravity, but also centrifugal force, and the combination of various forces can make the movement in the universe uniform.

Other planets that are attracted by the Sun's strong gravitational pull also have a certain centrifugal force, which is the result of the balance of the forces generated by the rotation of the planets and the forces generated by the inertial motion. The gravitational pull of the sun pulls the planet in the middle, while the centrifugal force pushes the planet outward, so that the two forces cancel out the planet and do not suck it up.

The Sun is the closest star to Earth and is the central body of the solar system. The mass of the solar system is concentrated in the sun, and its strong gravitational pull controls the movement of celestial bodies such as large and small planets and comets.

It has given birth to the civilization of the earth and has always influenced the life of the earth. It is the only star whose surface structure can be studied in detail and is a huge astrophysics laboratory.

But the Sun is just an ordinary member of the 100 billion stars in the Milky Way, located near the symmetry plane of the Milky Way, about 33,000 light-years from the center of the Milky Way and about 26 light-years north of the galactic plane, on the one hand, it rotates around the galactic center at a speed of 250 kilometers per second, and on the other hand, it moves at a speed of kilometers per second relative to the surrounding stars in the direction of Vega.

Extended Materials. The evolution of the sun.

The Sun was formed about 100 million years ago in a cloud of collapsed hydrogen molecules. The time of the Sun's formation is measured in two ways: the Sun's current age in the main sequence zone, confirmed using computer models of stellar evolution and primordial nucleosynthesis, which is about 100 million years old.

This is very consistent with the radioactive dating of the oldest material of the sun is 100 million years old. The Sun has reached middle age in the evolutionary phase of its main sequence, in which nuclear fusion is the fusion of hydrogen into helium at the core.

More than 4 million tons of matter are converted into energy in the Sun's core every second, producing neutrinos and solar radiation. At this rate, the Sun has so far converted about 100 Earth-masses of matter into energy, and the total time spent by the Sun in the main sequence is about 10 billion years.

The gravitational pull of the Sun on the Earth is about x 10 22 Newtons (about x 10 21 kgf).

This gravitational value is very huge and it is created due to the mass attraction between the Sun and the Earth. The quality of the Sun is relatively large, and it is very close to the Earth, so its gravitational pull on the Earth is very strong. This gravitational pull allows the Earth to maintain a stable orbit in the solar system.

If it is considered that the planets move in a uniform circle around the Sun, then the gravitational pull f of the Sun on the planets should be the centripetal force experienced by the planets, i.e.

f=mv^2/r

where r is the distance between the sun and the planet, v is the linear velocity of the planet's motion, and m is the mass of the planet.

The relation v=2 r t of the period t and velocity v in circular motion

Substituting the above equation is f=4 2(r 3 t 2)m r 2

According to Kepler's description of the laws of planetary motion, r 3 t 2 is a constant, so it can be concluded that the gravitational force between the planet and the sun is directly proportional to the mass of the planet and inversely proportional to the quadratic of the distance from the planet to the sun.

According to Newton's third law, the force of a planet to attract the Sun is equal in magnitude and has the same properties as the force of the Sun to attract a planet. Newton believed that since this gravitational force is proportional to the mass of the planet, it should of course also be proportional to the mass of the sun. Therefore, if you use m'Indicates the mass of the sun, then there is.

f∞m'm/r^2

Written as an equation, it is f=gm'm/r^2

g is a constant, which is the same for any planet.

Newton also studied the motion of the moon around the earth and found that the gravitational pull between them followed the same law as the gravitational pull between the sun and the planets.

Newton studied the gravitational attraction of many different objects that follow the same law, and further extended this law to any two objects in nature, officially publishing the law of universal gravitation in 1687

Any two objects in nature are attracted to each other, and the magnitude of the gravitational force is directly proportional to the product of the masses of the two objects and inversely proportional to the quadratic of their distance.

If m1 and m2 are used to denote the masses of two objects, and r is used to denote their distance, then, the law of universal gravitation can be expressed by the following formula:

f=gm1m2/r^2

The unit of mass is kg, the unit of distance is m, and the unit of force is used as a constant, which is called the gravitational constant, which applies to any two objects, and it is numerically equal to the interaction force when two objects with a mass of 1kg are 1m apart, and the standard slow value of the gravitational constant is g=

Usually taken. g=6367*10^-11nm^2/kg^2