Gravity Is Just A Theory
StarChild Question of the Month for Feb 2001
Question:
What is gravity?
Answer:
Nosotros don't really know. We can ascertain what it is as a field of influence, considering we know how it operates in the universe. And some scientists call back that it is made up of particles called gravitons which travel at the speed of calorie-free. Withal, if nosotros are to be honest, we exercise not know what gravity "is" in any cardinal way - we merely know how it behaves.
Here is what nosotros practice know...
Gravity is a forcefulness of attraction that exists between whatsoever two masses, any two bodies, any ii particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists betwixt all objects, everywhere in the universe. Sir Isaac Newton (1642 -- 1727) discovered that a forcefulness is required to change the speed or management of motion of an object. He also realized that the forcefulness chosen "gravity" must brand an apple fall from a tree, or humans and animals alive on the surface of our spinning planet without being flung off. Furthermore, he deduced that gravity forces exist betwixt all objects.
Newton's "police force" of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations. The gravitational equation says that the force of gravity is proportional to the product of the two masses (chiliad1 and m2), and inversely proportional to the square of the altitude (r) between their centers of mass. Mathematically speaking,
F=Gmim2 / rtwo,
where G is chosen the Gravitational Constant. It has a value of 6.6726 10 10-eleven m3 kg-1 s-2.
The event of gravity extends from each object out into infinite in all directions, and for an space distance. However, the strength of the gravitational force reduces quickly with distance. Humans are never aware of the Sun's gravity pulling them, considering the pull is so small at the distance between the World and Sun. Withal, it is the Sunday'south gravity that keeps the Globe in its orbit! Neither are we aware of the pull of lunar gravity on our bodies, but the Moon'south gravity is responsible for the sea tides on Earth.
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| The story of Isaac Newton discovering the laws of gravity past watching apples falling from a tree is probably merely a myth. He did do his work on gravity while at a subcontract, merely that is well-nigh as much equally can be proven. |
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Gravity Is Just A Theory,
Source: https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question30.html
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