What Is Gravity?.
-Crazy Facts Of Cosmology.
Gravity is a fundamental force of nature.
: -We do not know what cause it.
: -We can only describe it.
Law Of Universal Gravitation: -Every particle in the universe attracts every other particle with a force. ie. Directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
It's the force we all know about and think we understand. It keeps our feet firmly on the ground and our world circling the sun.
Yet look a little closer , and the certainties start to float away, revealing gravity as the most puzzling and the least understood of the four fundamental forces of nature.
Falling Objects: -Galileo's Experiment
: -If a person drops a 10 pound ball and a 5 pound ball of a building at the same time, which one will hit the ground first?
: - Will gravity pull harder on the 10 pound ball?
: -This was the topic of a famous story about scientist Galileo Galilei who is said to have tried dropping two objects from the leaning Tower of Pisa to find the answer of this question.
: -You might be surprised to find out that the two objects hit the ground at almost the same time.
: -Gravity work the same on all objects unless wind resistance gets in the way.
The apple is attracted to the earth. The earth is also attracted to the apple.
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