# Opinions on **Newton's law of universal gravitation**

Here you have a list of opinions about Newton's law of universal gravitation and you can also give us your opinion about it.You will see other people's opinions about Newton's law of universal gravitation and you will find out what the others say about it.

Also, you will see opinions about other terms. Do not forget to leave your opinion about this topic and others related.

*"Newton's law" redirects here. For the thermodynamic law, see Newton's law of cooling.*

**Newton's law of universal gravitation** states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. (Separately it was shown that large spherically symmetrical masses attract and are attracted as if all their mass were concentrated at their centers.) This is a general physical law derived from empirical observations by what Isaac Newton called induction. It is a part of classical mechanics and was formulated in Newton's work *Philosophiæ Naturalis Principia Mathematica* ("the Principia"), first published on 5 July 1687. (When Newton's book was presented in 1686 to the Royal Society, Robert Hooke made a claim that Newton had obtained the inverse square law from him – see History section below.) In modern language, the law states the following:

Assuming SI units, *F* is measured in newtons (N), *m*_{1} and *m*_{2} in kilograms (kg), *r* in meters (m), and the constant *G* is approximately equal to 6.674×10 N m kg. The value of the constant *G* was first accurately determined from the results of the Cavendish experiment conducted by the British scientist Henry Cavendish in 1798, although Cavendish did not himself calculate a numerical value for *G*. This experiment was also the first test of Newton's theory of gravitation between masses in the laboratory. It took place 111 years after the publication of Newton's *Principia* and 71 years after Newton's death, so none of Newton's calculations could use the value of *G*; instead he could only calculate a force relative to another force.

Newton's law of gravitation resembles Coulomb's law of electrical forces, which is used to calculate the magnitude of electrical force between two charged bodies. Both are inverse-square laws, in which force is inversely proportional to the square of the distance between the bodies. Coulomb's law has the product of two charges in place of the product of the masses, and the electrostatic constant in place of the gravitational constant.

Newton's law has since been superseded by Einstein's theory of general relativity, but it continues to be used as an excellent approximation of the effects of gravity. Relativity is required only when there is a need for extreme precision, or when dealing with very strong gravitational fields, such as those found near extremely massive and dense objects, or at very close distances (such as Mercury's orbit around the sun).

In the image below, you can see a graph with the evolution of the times that people look for Newton's law of universal gravitation. And below it, you can see how many pieces of news have been created about Newton's law of universal gravitation in the last years.

Thanks to this graph, we can see the interest Newton's law of universal gravitation has and the evolution of its popularity.

# What do you think of Newton's law of universal gravitation?

You can leave your opinion about Newton's law of universal gravitation here as well as read the comments and opinions from other people about the topic.It's important that all of us leave our opinions about Newton's law of universal gravitation to have a better knowledge about it: