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# Gravity

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Time to learn gravity

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### Gravity

1. 1. The Source to our Existence
2. 2.  Gravity is a force pulling together all matter (which is anything you can physically touch). The more matter, the more gravity, so things that have a lot of matter such as planets and moons and stars pull more strongly.  Mass is used to measure the amount of matter in something. The bigger something is, the stronger its gravitation pull becomes. As we walk on the surface of the Earth, it pulls on us, and we pull back. But, the Earth has much more mass than us, the pull from us is not strong enough to move the Earth, where as the pull from the Earth can make us fall flat on our faces.  In addition to differences in the amount of mass an object contains, gravity also depends on the distance of objects. This is why we are held down to the surface of the Earth, instead of being pulled off into the gravitation of Sun, which is has hundreds of times the gravity of the Earth.
3. 3.  Mass is used to talk about how much matter there is in something. (Matter is anything you can touch physically.) On Earth, we weigh things to figure out how much mass there is. The more matter there is, the more something will weigh. Usually, the amount of mass something has is related to its size, but that’s not always the case. A balloon blown up bigger than your head will still have less matter inside it than your head (for most people, anyhow) and therefore the balloon has less mass.  The difference between mass and weight is that weight is determined by how much something is pulled by gravity. If we are comparing two different things to each other on Earth, they are pulled the same by gravity and so the one with more mass weighs more. But in space, where the pull of gravity is very small, something can have almost no weight. It still has matter in it, though, so it still has the same mass.
4. 4.  Gravity brings us back down to the ground when we jump up. It stops us from floating into space. Gravity keeps our food on our plates and our drinks in our glasses. Gravity keeps the Earth in orbit around the sun and keeps us warm. Gravity also keeps the water on the Earth, the inhabitants on Earth, and the Earth's atmosphere in its place. Gravity pulls rain and snow down to our rivers.
5. 5.  I begins with the famous story of Sir. Isaac Newton. He was hit in the head with an apple which fell from an apple tree. This inspired him to question why the apple fell. On 1687 Newton states his Law of Universal Gravity, which states that there is a gravitational force acting between any two objects in the universe at any given time.
6. 6.  Galileo Galilee also contributed to the discovery. Before Newton's discovery of gravity, Galileo conducted experiments which showed that all objects fall at the same rate, regardless of their mass. The name of the experiment was the free fall experiment. In this experiment Galileo dropped two objects of different masses off of the Leaning tower of Pisa. This illustrated the fact that objects of different masses fell at the same rate of speed.
7. 7. WHO DISCOVERED THE UNIVERSAL LAW OF GRAVITY WHO DISCOVERED THE CONCEPT OF FREE FALL
8. 8.  http://www.google.com/imgres?imgurl=http://static.duartes.org/img/blogPosts/galileo- computers.gif&imgrefurl=http://duartes.org/gustavo/blog/category/programming&usg=__cFk1qivn_BiMvg18XMYJ_ikRsMs=&h =343&w=231&sz=19&hl=en&start=188&sig2=CP6WtZ6hpGzO3n1efk6l2g&zoom=1&tbnid=W1ZLhXfMjSbrOM:&tbnh=154&tbnw=1 04&ei=aHPYTI_3F46gOper2KgJ&prev=/images%3Fq%3Dgalileo%2Btower%2Bof%2Bpisa%26um%3D1%26hl%3Den%26client%3Dfi refox-a%26rls%3Dorg.mozilla:en- US:official%26biw%3D1280%26bih%3D834%26tbs%3Disch:10%2C5244&um=1&itbs=1&iact=hc&vpx=733&vpy=385&dur=260&hovh =274&hovw=184&tx=115&ty=129&oei=PXPYTILbNoWmsQOH- ZmQCw&esq=8&page=8&ndsp=25&ved=1t:429,r:22,s:188&biw=1280&bih=834  http://scienceprojectideasforkids.com/2009/sir-isaac-newton/  http://ellerbruch.nmu.edu/classes/cs255f03/cs255students/jedens/p4/factpg4.html  http://www.juliantrubin.com/bigten/galileofallingbodies.html  http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-is-mass.html  http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-what-is-gravity.html  http://www.youtube.com/watch?v=H0pGEq7bhLM&feature=fvw