# Gravitational Force: Evidence & Distance

• Blenton
In summary, the conversation discusses the possibility of the force of gravitation continuing indefinitely with respect to distance, and the evidence that supports it. It also explores the idea of the force of gravity diminishing at a certain distance, similar to other forces. Further, it raises the question of whether the expansion of the universe could eventually exceed the speed of light and how this could affect the force of gravity between objects.
Blenton
How do we know that the force of gravitation continues indefinitely with respect to distance? Is there any evidence to support it? Could it be possible that it works on a large scale, but drops to zero at a certain distance much like other forces eg. strong nuclear?

Hi there,

It could certainly be. Therefore, you would need very, very, very far to see if you ideas could maybe work. Because, we just notice, by looking up in the sky, that the gravitational theroy seems to work even on larger scales, e.g. attraction between galaxies. Therefore, we could suppose that the mathematical model can be applied anywhere in the Universe.

Cheers

At some distance 2 objects will no longer feel gravity from each other due to the expanding universe.
That is if gravity travels at the speed of light. Others here can correct me if I am wrong here but at some point wouldn’t the speed of expansion exceed the speed of light. The expansion is cumulative isn’t it?
If we know how much expansion there is in a given distance could we find the distance where the expansion exceeds the speed of light, and is this making any sense to anyone?
I have been pondering this for some time now.

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Because, we just notice, by looking up in the sky, that the gravitational theroy seems to work even on larger scales, e.g. attraction between galaxies.

But do we notice the furthest galaxy having an attraction on the furthest galaxy away from that one? Perhaps its only neighbouring galaxies that have any effect on each other.

## 1. What is the definition of gravitational force?

Gravitational force is the attraction between two objects with mass. It is one of the fundamental forces in the universe and is responsible for the motion of planets, stars, and other celestial bodies.

## 2. How is gravitational force measured?

Gravitational force can be measured using the equation F=G*(m1*m2)/d^2, where F is the force, G is the gravitational constant, m1 and m2 are the masses of the two objects, and d is the distance between them. It is typically measured in Newtons (N).

## 3. What are some examples of evidence for gravitational force?

One of the most famous examples of evidence for gravitational force is the orbit of the planets around the sun. This demonstrates the gravitational pull of the sun on the planets. Other evidence includes the tides caused by the moon's gravitational pull on Earth, and the bending of light around massive objects like galaxies.

## 4. How does distance affect gravitational force?

According to the equation F=G*(m1*m2)/d^2, distance has an inverse square relationship with gravitational force. This means that as the distance between two objects increases, the gravitational force between them decreases. For example, the force between Earth and the moon is stronger than the force between Earth and the sun due to their different distances.

## 5. What is the role of gravitational force in everyday life?

Gravitational force plays a crucial role in keeping our solar system in balance and allowing life to exist on Earth. It also has practical applications, such as keeping satellites in orbit and allowing us to measure the mass of planets and stars. Additionally, it is the force that causes objects to fall to the ground, making it essential for activities like walking, driving, and sports.

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