Understanding the Gravity of the situation
To escape the Earth and travel into space, one has to overcome its gravitational pull.
From experimental data it can be shown that:
1. There is a gravitational pull between all bodies with mass. They attract each other.
2. Bodies with large masses have large pull. So big planets have high gravity.
3. The further they are from each other the smaller the gravitational pull between them.
4. Results show that at twice the distance the gravitational pull between the bodies is ¼.
At 3 times the distance, the pull is one ninth. This is called an 'INVERSE SQUARE' law.
The Moon is smaller than the Earth, so its gravitational pull is less than the Earth's. A person on the Moon can lift 5 times as much more weight as on Earth. The same weight will crush him on Jupiter.
Continue... Artificial Satellites