Thread: Thinking about Newton's theory about gravity

i was thinking recently about Newton's theory about gravity , i was thinking wt made him think there is already gravity . all of us know about the fallen apple story that led to this theory but i thought may be there is a hugeeeeeeeeee magnet in the earth crust or surface but has different chemistry than the ordinary magnets we already know ,so this magnet is pulling us to the centre of the earth, so wt do u think ???

Thats a hard one, the universe has no weight, and none knows what produces gravity, is it the spin, or simply mass produces gravity. Or yes a new sort of magnetic field.

It is thought that fundamental particles interact with the Higgs Field giving them their mass- the amount of mass an object has is proportional to the strength of the gravitational force it produces; so two objects have a gravitational force between them as



where G is Newton's gravitation constant (6.67 x 10^-11 N (m/kg)² and r is the distance between the 2 objects centres' of gravity. This is an example of the inverse square law discovered by Newton- as is used for the electrical force between two charged plates too.

Gravity is treated differently in Einstein's Theory of General Relativity, however, as he proposed that space-time is curved by matter and this curvature gives the gravity of an object- the amount of curvature will show the strength of the gravitational force "produced" by that object.

Originally Posted by Dou7a

i was thinking recently about Newton's theory about gravity , i was thinking wt made him think there is already gravity . all of us know about the fallen apple story that led to this theory but i thought may be there is a hugeeeeeeeeee magnet in the earth crust or surface but has different chemistry than the ordinary magnets we already know ,so this magnet is pulling us to the centre of the earth, so wt do u think ???

One of the things that Newton did is test gravity with a bunch of different substances. We still do this today. So we know that gravity works with all kinds of different substances while magnetism does not.

It is important to remember that Newton did not invent gravity; his theory was to extend the gravity of the Earth to everything in the solar system and to explain the motion of all celestial objects in the solar system solely through their gravitational interactions.

Originally Posted by Dou7a

i was thinking recently about Newton's theory about gravity , i was thinking wt made him think there is already gravity . all of us know about the fallen apple story that led to this theory but i thought may be there is a hugeeeeeeeeee magnet in the earth crust or surface but has different chemistry than the ordinary magnets we already know ,so this magnet is pulling us to the centre of the earth, so wt do u think ???

So let's see, you would replace gravity with magnetism, however a "magnetism" that attracts objects whether or not they are attracted by normal magnets, that has a strength that is proportional not to the magnetic domains in the the objects involved but instead their inertial masses, and only attracts.

Such a "magnetism" is so different from anything that we now called magnetism that it qualifies as being a completely different force. As such, we should give it a new name, say, gravity.