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# how did newton come up with the law of gravity

The legend is that Newton discovered Gravitywhen hesaw a falling applewhile thinking about the forces of nature. Whatever really happened,Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest.

## How did Newton derive his law of gravity?

How did Newton derive the gravitational law? Sir Isaac Newton’s inspiration for the Law of Universal Gravitation was from the dropping of an apple from a tree. Newton’s insight on the inverse-square property of gravitational force was from intuition about the motion of the earth and the moon. How did Newton develop his laws of ]

## What is newtons universal law of gravitation?

Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with force directly proportional to the product of the masses and inversely proportional to the square of the distance between them. The universal gravitation equation thus takes the form Universal Gravitation Equation

## What does Newton say about the universal law of gravitation?

Newton’s universal law of gravitation says that the force acting upon (and therefore the acceleration of) an object toward Earth should be inversely proportional to the square of its distance from the center of Earth. … It is this force of gravity on the surface of Earth that gives us our sense of weight.

## What was the basic behind Newton’s law of gravity?

t. e. ‘slaw of universal gravitationis usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The publication of the theory has become known as the first …

## What is the equation for the magnitude of the gravitational force acting between masses M1 and M2 separated by distance?

In Newton’s equation F12 is the magnitude of the gravitational force acting between masses M1 and M2 separated by distance r12. The force equals the product of these masses and of G, a universal constant, divided by the square of the distance. The constant G is a quantity with the physical dimensions (length) 3 / (mass) (time) 2;

## What is the force of gravity between bodies?

Newton saw that the gravitational force between bodies must depend on the masses of the bodies. Since a body of mass M experiencing a force F accelerates at a rate F / M, a force of gravity proportional to M would be consistent with Galileo’s observation that all bodies accelerate under gravity toward Earth at the same rate, a fact that Newton also tested experimentally. In Newton’s equation F12 is the magnitude of the gravitational force acting between masses M1 and M2 separated by distance r12. The force equals the product of these masses and of G, a universal constant, divided by the square of the distance.

## What is the attractive force of a number of bodies of masses?

The attractive force of a number of bodies of masses M1 on a body of mass M is where Σ 1 means that the forces because of all the attracting bodies must be added together vectorially. This is Newton’s gravitational law essentially in its original form. A simpler expression, equation (5), gives the surface acceleration on Earth.

## What is the acceleration of the Moon?

Newton found the Moon’s inward acceleration in its orbit to be 0.0027 metre per second per second , the same as (1/60) 2 of the acceleration of a falling object at the surface of Earth. gravitational force. Earth’s gravitational force weakens with increasing distance. Encyclopædia Britannica, Inc.

## How long is the Moon’s orbit?

Effects of gravity on Earth and the Moon. The Moon’s orbit has a radius of about 384,000 km (239,000 miles; approximately 60 Earth radii), and its period is 27.3 days (its synodic period, or period measured in terms of lunar phases, is about 29.5 days).

## How did Newton find the magnitude of Kepler’s laws?

Newton first estimated the magnitude of G by assuming Earth’s average mass density to be about 5.5 times that of water (somewhat greater than Earth’s surface rock density) and by calculating Earth’s mass from this. Then, taking ME and rE as Earth’s mass and radius, respectively, the value of G was which numerically comes close to the accepted value of 6.6743 × 10 ?11 m 3 s ?2 kg ?1, first directly measured by Henry Cavendish.

## What is Newton’s law of gravity?

Newton’s law of gravity. Newton discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth. By his dynamical and gravitational theories, he explained Kepler’s laws and established the modern quantitative science of gravitation. Newton assumed the existence of an attractive force between all massive …

## What did Newton discover about the Moon?

Newton discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth. By his dynamical and gravitational theories, he explained Kepler’s laws and established the modern quantitative science of gravitation. Newton assumed the…

## What is Newton’s law of gravitation?

Newton’s law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them. In symbols, the magnitude of the attractive force F is equal to G (the gravitational constant, …

## What is an encyclopedia editor?

Encyclopaedia Britannica’s editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.

## Who discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth?

Newton discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth. By his dynamical and… The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Barbara A. Schreiber. History at your fingertips.

## Who created the laws of motion?

Isaac Newton put forward the law in 1687 and used it to explain the observed motions of the planets and their moons, which had been reduced to mathematical form by Johannes Kepler early in the 17th century.

## What is Newton’s Law of Gravitation?

The law of gravitation states that- every object in the universe attracts every other object such that the force exerted will be proportional to the product of the masses and inversely proportional to the square of the distance between them.

## How are mass and weight proportional?

The measure of how much matter is in an object is known as mass, while weight is the measure of the gravitational force exerted on the material in a given gravitational field; thus, mass and weight are proportional to each other. ? W∝ m. Where, m – The mass of the object. ? W = mg.

## What is the inverse square law?

From equation (4) we find that the force acting on each other will be directly proportional to the product of point masses and inversely proportional square of the distance between them. It is also known as the inverse square law. In some articles, it is also referred to as the first law of gravity.

## Why is Newton’s law of gravitation universal?

Ans: It is known as universal law because Newton’s law of gravitation is valid for every object having mass.

## How is equation 3 rearranged?

Equation (3) is re-arranged by removing proportionality and replacing it with a constant known as gravitational constant.

## How to find the weight of an object?

The weight of an object can be estimated by multiplying the mass m of the object by the acceleration due to gravity, g , at the surface of the Earth. The measured acceleration due to gravity at the Earth’s surface is found to be about 9.8 m/s2 or 980 cm/s2.

## What is the first law of gravity?

It is also known as the inverse square law. In some articles, it is also referred to as the first law of gravity. The gravitational force acting between two objects is only due to their masses. The gravitational force is one of the four basic forces of physics.

## Why did Galileo start making experiments on incline?

Then, maybe to prove this theory, maybe because he noticed something was off, Galileo started making several experiments on an incline in which friction was constantly diminished, by polishing, and noticing that the velocity, at constant force, was far from constant, i.e. the object was accelerating. In doing this Galileo recorded a lot of data and recorded them in a mathematical formulation. This was indeed his great belief: that Nature could be described with mathematics and (though not really his) it was a successful idea: the experiment, when put in a mathematical representation, clearly indicated the F = m a relationship.

## What does Aristotle’s law say about force?

Aristotle (yet again) and his disciples had observed that if you push an object, the object moves, so he postulated that (as we would say today) Force is proportional to velocity ( F ∝ v ). This now seems naive, as we know F ∝ a, but if you think about it, Aristotle’s law reflects most of everyday’s experience, i.e. objects falling down, objects falling in water, pushing objects etc., because (we know now) there is friction and because of terminal velocity objects do seem to fall at constant speed (the transient time of acceleration is very small!)

## What is the meaning of "back up"?

Making statements based on opinion; back them up with references or personal experience.

## How long after Newton’s death did he test his theory?

Newton’s theory would not be directly tested experimentally (and G measured) until much later, more than 70 years after Newton’s death.

## What is crude idealization?

A crude idealization of the scientific process is: Scientist finds unexplained phenomenon. Posits a theory that would explain the phenomenon, and makes additional testable predictions. The goal is not just to explain what we’ve already seen, but predict things we haven’t tried yet. Start testing its predictions.

## Is physics a convoluted system?

So physics is a convoluted system: theories inspire experiments, experiments modify theories, and so on and so on, and everything also depend on the social, economical, religious etc. background of the people doing science!

## Can you wake up and declare a new natural law?

It used to work somehow like this: I observe something and I have a given framework of ideas (a belief, a religion, etc.), I match the two things together and voila’. Anybody can one wake up one day a declare a new natural law . Of course, people will believe the law only if it does not openly contradicts some other observations (or their belief).

## How did Newton predict the shape of the Earth?

Newton also used the law of universal gravitation to predict how the shape of the Earth deviates from perfect sphericity (see figure of the Earth ). In the 1710s and 1720s, the Cassinis, a family of distinguished astronomers originally from Italy (see Giovanni Domenico Cassini) who’d settled in France and who controlled the Paris Observatory, claimed to have determined by their measurements that the Earth was prolate (shaped like a rugby ball), rather than oblate (flattened at the poles) as predicted by Newton; see spheroid. French savants invoked the Cassinis’ measurements in defense of René Descartes ’s physical system against Newtonianism.

## Why did Halley travel to Cambridge?

Halley travelled from London to Cambridge in August of 1684 because he’d heard that Newton, a reclusive Cambridge professor who’d published important work on optics twenty years before and was rumored to be a mathematical genius, might have something interesting to tell him about celestial mechanics.

## What was Newton working on?

Thus, Newton was working from the astronomical observations of Brahe, as re-interpreted in light of Copernicus’s heliocentric system and summarized in the form of Kepler’s three laws. At the time, Newton wasn’t the only one eager to account for Kepler’s kinematical laws in terms of a dynamical theory of gravity.

## How did Newton arrive at his law of gravitation?

According to a famous anecdote, when Newton was old and famous and someone asked him how he’d arrived at his law of universal gravitation, his response was, “By thinking on it continually.”

## What is the orbit of a planet?

The orbit of a planet is an ellipse, with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.

## What is a line segment joining a planet and the Sun?

A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.

## Where is Edmond Halley’s memorial?

Memorial to Edmond Halley (1656–1742) in Westminster Abbey, London. Source: The Scientific Tourist in London: #8 Edmond Halley Memorial. This question originally appeared on Quora. – the knowledge sharing network where compelling questions are answered by people with unique insights.

## What are Newton’s Laws of Motion?

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

## What did Isaac Newton do?

Sir Isaac Newton worked in many areas of mathematics and physics. He developed the theories of gravitation in 1666 when he was only 23 years old. In 1686, he presented his three laws of motion in the “Principia Mathematica Philosophiae Naturalis.”. By developing his three laws of motion, Newton revolutionized science.

## What is the law of motion that states that an object will remain at rest?

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force. Newton’s first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

## What are some examples of aerodynamics?

Examples of action and reaction involving aerodynamics: 1 The motion of lift from an airfoil, the air is deflected downward by the airfoil’s action, and in reaction, the wing is pushed upward. 2 The motion of a spinning ball, the air is deflected to one side, and the ball reacts by moving in the opposite 3 The motion of a jet engine produces thrust and hot exhaust gases flow out the back of the engine, and a thrusting force is produced in the opposite direction.

## What is the definition of acceleration?

The change in velocity divided by the change in time is the definition of the acceleration a. The second law then reduces to the more familiar product of a mass and an acceleration:

## What is the second law of force?

His second law defines a force to be equal to change in momentum (mass times velocity) per change in time. Momentum is defined to be the mass m of an object times its velocity V.

## What is the tendency to resist changes in a state of motion?

This tendency to resist changes in a state of motion is inertia. There is no net force acting on an object (if all the external forces cancel each other out). Then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force acts on an object, the velocity will change because …

## What is Isaac Newton’s theory?

Isaac Newton is best know for his theory about the law of gravity, but his “Principia Mathematica” (1686) with its three laws of motion greatly influenced the Enlightenment in Europe. Born in 1643 in Woolsthorpe, England, Sir Isaac Newton began developing his theories on light, calculus and celestial mechanics while on break from Cambridge …

## What are some interesting facts about Ancient Egypt?

8 Facts About Ancient Egypt’s Hieroglyphic Writing. 1917. The 1917 Bath Riots. “Principia” propelled Newton to stardom in intellectual circles, eventually earning universal acclaim as one of the most important works of modern science. His work was a foundational part of the European Enlightenment.

## What are Newton’s laws of motion?

The result was the 1687 publication of “Philosophiae Naturalis Principia Mathematica” (Mathematical Principles of Natural Philosophy), which established the three laws of motion and the law of universal gravity. Newton’s three laws of motion state that (1) Every object in a state of uniform motion will remain in that state …

## When did Newton develop the concept of fluxions?

Newton had developed his concept of “fluxions” (differentials) in the mid 1660s to account for celestial orbits, though there was no public record of his work.

## What was Newton’s second book?

Newton’s second major book, “Opticks,” detailed his experiments to determine the properties of light. Also a student of Biblical history and alchemy, the famed scientist served as president of the Royal Society of London and master of England’s Royal Mint until his death in 1727.

## Where was Isaac Newton born?

Isaac Newton was born on January 4, 1643, in Woolsthorpe, Lincolnshire, England . The son of a farmer who died three months before he was born, Newton spent most of his early years with his maternal grandmother after his mother remarried. His education was interrupted by a failed attempt to turn him into a farmer, and he attended the King’s School in Grantham before enrolling at the University of Cambridge’s Trinity College in 1661.

## Who discovered the laws of gravity?

Isaac Newton and the Law of Gravity. In 1684, English astronomer Edmund Halley paid a visit to the secluded Newton. Upon learning that Newton had mathematically worked out the elliptical paths of celestial bodies, Halley urged him to organize his notes. The result was the 1687 publication of “Philosophiae Naturalis Principia Mathematica” …