* Newton's Law of Universal Gravitation: This law states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
* Inverse Square Law: The "inverse square" part is crucial. It means that if you double the distance between the objects, the gravitational force becomes four times weaker (2 squared = 4). If you triple the distance, the force becomes nine times weaker (3 squared = 9).
In simpler terms:
Imagine two magnets. When they're close together, they attract strongly. As you pull them further apart, the attraction weakens. The same principle applies to gravity, although it's much weaker than the magnetic force we experience in everyday life.
Example:
* The Earth pulls on the Moon with a certain force.
* If the Moon were twice as far away from Earth, the gravitational force between them would be four times weaker.
* If the Moon were three times as far away, the force would be nine times weaker.
Important Note:
While moving objects apart weakens the force of gravity, it never completely eliminates it. Gravity has an infinite range, meaning it acts over any distance, albeit becoming extremely weak at great distances.
