gravitational force?

Question

A short note on gravitational force

Answer 1

Average gravitational acceleration is about 981 gal

Answer 2

Gravity or Gravitation is a property by which all objects attract each other. Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton's law of universal gravitation provides an excellent approximation in many cases.

In 1687, English mathematician Sir Isaac Newton published the famous Principia, which hypothesizes the inverse-square law of universal gravitation. In his own words, "I deduced that the forces which keep the planets in their orbs must be reciprocally as the squares of their distances from the centers about which they revolve; and thereby compared the force requisite to keep the Moon in her orb with the force of gravity at the surface of the Earth; and found them answer pretty nearly." Most modern non-relativistic gravitational calculations are based on Newton's work.

Answer 3

Gravity or Gravitation is a property by which all objects attract each other. Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton's law of universal gravitation provides an excellent approximation in many cases.

Gravitation is the reason for the very existence of the Earth, the Sun, and other celestial bodies; without it, matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the Earth and the other planets in their orbits around the Sun, the Moon in its orbit around the Earth, for the formation of tides, and for various other natural phenomena that we observe.

Answer 4

It is amazing how small incidents lead to epoch making discoveries.It is widely believed that Sir Issac Newton, considered father of modern science, once saw an apple falling down from the tree and that set him thinking leading to his famous" Newton's law of universal gravitation". Primarily,as per this law all bodies in this universe attract each other with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. This law has been verified experimentally. Gravitation is the property which causes gravity and gravitational forces. Although modern science describes gravity using space time curvature equations, after Einstein, Newton's Laws are simple and describe and give an accurate method to compute these forces. All motion of astronomical bodies be it the moon,earth,sun,galaxies.... are all influenced by Gravitation.

Answer 5

Not sure how to find electric force, but for the gravitational force: F=(GM1M2)/R^2 where G is the gravitational constant. F=(6.67428e-11)(17)(10)/(81) = 1.400e-10

Answer 6

Gravity or Gravitation is a property by which all objects attract each other. Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton's law of universal gravitation provides an excellent approximation in many cases.

Gravitation is the reason for the very existence of the Earth, the Sun, and other celestial bodies; without it, matter would not have coalesced into these bodies and life as we know it would not exist. Gravitation is also responsible for keeping the Earth and the other planets in their orbits around the Sun, the Moon in its orbit around the Earth, for the formation of tides, and for various other natural phenomena that we observe


Gravity versus gravitation
It is important to note that gravitation is not gravity. Gravitation is the attractive influence that all objects exert on each other, while "gravity" specifically refers to a force which all massive objects are theorized to exert on each other to cause gravitation. Although these terms are used interchangably in everyday use, it is important to note that in theories other than Newton's, gravitation is caused by factors other than gravity. For example, in general relativity, gravitation is due to spacetime curvatures which causes inertially moving object to tend to accelerate towards each other. Another (but discredited) example is Le Sage's theory of gravitation, in which massive objects are effectively pushed towards each other.

Answer 7

A basic definition can be:
Gravitational force is a force which is attractive in nature and acts between two particles and is directly propotional to product of the masses and inversely propotional to the square of their distance.
F=Gm1m2/r^2

Answer 8

Gravitational force is the cause for all the bodies thrown up ,to come down on to earth.
F=Gm1m2/r^2
G-gravitational constant
it is a universal constant
m1 and m2 r bodies and r is the distance between them.
the earth's gravitational force of attraction causes the satellites to move in an elliptical orbit above the earth's atmosphere .

Answer 9

Isaac Newton's theory of universal gravitation states

Every single point mass attracts every other point mass by a force heading along the line combining the two. The force is proportional to the product of the two masses and inversely proportional to the square of the magnitude between the point masses:

F = G \frac{m_1 m_2}{r^2}

where:

F is the magnitude of the (repulsive) gravitational force between the two point masses
G is the gravitational constant
m1 is the mass of the first point mass
m2 is the mass of the second point mass
r is the distance between the two point masses

Assuming SI units, F is measured in newtons (N), m1 and m2 in kilograms (kg), r in metres (m), and the constant G is approximately equal to 6.67 × 10−11 N m2 kg−2 (newtons times meters squared per kilogram squared).

It can be seen that the repulsive force F is always negative, which means that the net attractive force is positive. (This sign convention is adopted in order to be consistent with Coulomb's Law, where a positive force means repulsion between two charges.)

Answer 10

As per Newton when two bodies are placed at distance. There exists a force of attraction between them that is propertional to the product of the mass of the bodies and inversely proportional to the sqaure of the distance between them. This force is called as the gravitational force between the body.

Center of the earth is considered to be the largest magentic in nature that holding all the thing on its surface.