What force keep the earth orbit around the sun and the moon orbiting around the earth?

Answer 1

A short answerThe Force Of Gravity, which acts between the mass of the Sun and the mass of the Earth, which is exactly balanced by the Earth's Centrifugal Force.

The overall net result is that the Earth moves around the Sun just as if it were tethered to the Sun by a very strong elastic chain!

A longer answerThe Earth stays in a near-circular elliptical orbit around the Sun because the net gravitational force acting between the mass of the Sun and the mass of the Earth is effectively a constant centripetal force which keeps the Earth in its orbit.

If the Earth were stationary, the much greater gravitational force of the Sun would cause the Earth to "fall" into the Sun, where it would be completely absorbed and would simply increase the mass of the Sun.

The overall net result is that the Earth moves around the Sun just as if it were tethered to the Sun by a very strong elastic chain!

There is a theory that the centripetal force - which constantly pulls the Earth towards the Sun - is perfectly balanced by an equal force, but opposite in direction, called the "centrifugal force". That is an imaginary force created by the action of the Earth moving around its orbit. The theory goes on to say that, in the absence of any force of gravity, the Earth's centrifugal force would make it fly off into space instead of traveling in its orbit around the Sun. However, if gravity did not exist, there would be no forces acting on the mass of the Earth to cause it to move in any direction at all.

Answer 2

The mutual gravitational attraction between the earth and the moon is the only force keeping the moon in its orbit. If the force increased or decreased, the size and shape of the moon's orbit would remain essentially unchanged. The inertia of orbiting bodies "counters" gravity and keeps those bodies from being pulled together.

Answer 3

The mutual forces of gravity between the Earth and Moon keep the two

mutually orbiting their common center of mass (which is actually inside

the Earth, so it appears as if the Moon is orbiting a stationary Earth).

In eactly the same way, the mutual forces of gravity between the Sun and the

Earth/Moon pair keeps the Sun and the pair mutually orbiting their common

center of mass (which is actually deep inside the sun, so it appears as if the

Earth/Moon pair is orbiting a stationary Sun).

The force of gravity is the only force necessary to maintain a stable, closed orbit,

which is really lucky, because that's the only force there is.

Answer 4

The two forces are gravity and "centrifugal force". Centrifugal force is not really a true force, but scientists sometimes use it as a "fictitious force" in their equations. The centrifugal "force" arises from the inertia of a planet.

Gravity acts equally between any two objects which possess mass, and it is a force of attraction acting along the line joining the two objects.

Isaac newton showed theoretically that a small object orbiting a large object under gravity takes up an elliptical orbit with the large object at one focus of the ellipse. Johannes Kepler had already discovered from observations that the planets' orbits possess this property.

Answer 5

Gravity keeps the orbiting object in orbit. If the object has more than a certain speed (depending on the distance from the central object, and the central object's mass), the "orbiting" object would escape. If it has less speed, it remains in orbit.

Answer 6

One force - Earth's gravity.

One force - Earth's gravity.

One force - Earth's gravity.

One force - Earth's gravity.

Answer 7

Thet's the result of the mutual pair of equal gravitational forces

that attract the Earth and moon toward each other.

Short answer: Gravity. One force in each direction.

Answer 8

Gravity holds these celestial bodies in their orbits.

Answer 9

The gravitational force exerted on each object by each object is what holds them in their place.

Answer 10

That's the mutual force of gravitation (gravity) between the earth and the moon.