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Gravitation (Fun facts (Earth is round because of Gravity. Earth attracted…
Gravitation
Fun facts
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There is gravitational attraction between two marbles, but we don't notice it because the force between each of the marbles and the Earth is so much greater.
A person who weighs 100 pounds on the Earth would weigh only 17 pounds standing on the same scale on the moon.
According to Albert Einstein, there is no difference between the acceleration of Gravity and any other acceleration. If you were in a rocket accelerating at 32.2 ft/sec2, it would feel just like gravity on the Earth.
There are no known anti-gravity devices (ah shucks)! But the effects of Gravity can be canceled by free-fall or by placing objects in orbit.
No matter how great the distance between an object and the Earth, the Earth's gravitational force does not drop to 0. The gravitational influence of every object is exerted through all space.
Some theories suggest that G is changing over time and that G varies somewhat in different regions of space!
The first reliable measurement of G was made by Henry Cavendish in 1798! He calculated that G was equal to 6.754 10-11 newton-square meter per square kilogram
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In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers.
This was the theory of special relativity. It introduced a new framework for all of physics and proposed new concepts of space and time.
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Sir Isaac Newton quantified the gravity between two objects when he formulated his three laws of motion.
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