An object which is at certain height from the earth falls down due to gravitational but the moon does not fall down even though earths gravitational acts on it. why
Answers
It is said that Isaac Newton realized in 1666 that the power of gravity extends from objects falling on Earth to the Moon . He started thinking that perhaps the force pulling the Moon is the same force pulling all other objects (such as an apple falling from a tree) to the ground .
The image below (made with Photoshop) is not to scale but it represents (approximately and in a simplified way) the orbit of the Moon around the Earth .
Newton wondered why the Moon doesn't fall . The fact is the Moon is falling ; if it doesn't fall , it would go away from Earth following the line AB tangent to its orbit .
While the Moon travels through the arc AC , it is falling towards the Earth by the length BC.
So due to the force of gravitation the Moon is continually fallingSo due to the force of gravitation the Moon is continually falling towards the Earth , but it is also continually missing the Earth because it has a tangential velocity .
By the time the Moon rotating around the Earth falls a certain distance , it moves sideways about the same distance , getting away far enough to miss planet Earth . It's a delicate balance between falling (to Earth) and going away or escaping (from Earth) .
In both cases an equal and opposite force is acting on both the objects.
Therefore when earth pulls an object, It means that the object pulls the earth too.
But since the mass of earth is comparatively large, it's movement is
very small and hence negligible.
But moon has an appreciable mass in comparison with the earth and therefore it balances the pull of earth and is in constant equilibrium and doesn't fall into earth as well as it can't escape from earth's gravity.