This is usually called by Newton's Universal Law of Gravity. It is impossible for you who works and study in physics but you don't know about this law. This law was announced in Philosophiae Naturalis Principia Mathematica or well known by The Principia, Newton's first book about all of Mathematics and Physics law.
And here is the explanation of the law :
Every point mass attracts every single other point mass by a force pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance between them.
- F = Gravitational Force between masses ( Newton)
- G = Gravitational Constant (Newton metres2/kg2 )
- m1 = Mass 1 (kg)
- m2 = Mass 2 (kg)
- r = distance between 2 point of masses. (m)
The value of the constant G was first accurately determined from the results of the Cavendish experiment, 6.674×10−11 N m2 kg−2.
So, from this law, we know that every single thing which has mass they'll have gravitational force too. Then why we can't feel any force with other things?
Look at the Gravitational constant, the gravitational force will have value 0,00000000006674...Newtons for two things each mass 1 kilo and put in 1 metres distance between their point of mass. So it's so small value. You must have mass as an earth so you can feel it.