Physically what is it? Do we know? It is called a force, what use is that? What's it made of? If planets have it, how come they can make it? Do you need certain things or conditions to make gravity?
2007-09-24 09:22:41 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Gravity is not a thing, it's a force. You cannot observe it directly, but if you put two objects in space with no toher forces affecting them, they will move together. That is gravity at work.
You don't make it; it isnt an object. To get it, you need mass, ie stuff (even we have it, but we have so little you don't notice it). So every particle in the world has it. You only see it with planets and stars etc because only they are big enough. You can't build a machine that can make gravity.
What is it? It is an dent in space itself. Imagine space-tie as a rubber sheet. Any object will put a dent in it. That dent is gravity. And if another object gets too clsoe, it falsl into the den t(scientists call this dent a "Gravity well"), hence they come together.
2007-09-25 00:19:34 · answer #1 · answered by Bob B 7 · 0⤊ 0⤋
We don't have all of the answers about what gravity is. But it is not (repeat --not--) a force. Gravity is an acceleration. It only becomed a force when it acts on a mass (F=ma) The sooner you get that straight, the sooner a lot of Newtonian kinematics will start to make sense to you.
As far as we know, the only thig needed for gravity is for mass to exist. All mass exerts a gravitational acceleration on all other mass.
Doug
2007-09-24 16:30:58 · answer #2 · answered by doug_donaghue 7 · 1⤊ 0⤋
It is regarded as 'The Force of Gravity'. What it is exactly, not even the finest scientists can tell us.
Whoever says 'It's not a Force' is wrong.
We're told that weight is mass x Gravity (9.81m/s²) to give Newtons of FORCE.
It looks like you standing there asking this question.
It looks like rain falling from the clouds.
It looks like someone diving into a swimming pool.
It looks like the moon held in orbit out in space.
It looks like the Earth and Everything and Everyone on it.
2007-09-24 17:13:33 · answer #3 · answered by Norrie 7 · 0⤊ 0⤋
Jump out the window
when u hit the ground, it was gravity that put u there
2007-09-24 16:29:05 · answer #4 · answered by Anonymous · 0⤊ 1⤋
You can't see gravity but it's just a force. Plants don't have it they use it
2007-09-24 16:29:17 · answer #5 · answered by Anonymous · 1⤊ 1⤋
It looks like an apple falling on some dude's head.
http://www.williamsclass.com/EighthScienceWork/ImagesEighth/Newton-Apple.jpg
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2007-09-24 16:36:58 · answer #6 · answered by Anonymous · 0⤊ 0⤋
It looks like http://farm1.static.flickr.com/126/349562912_0b51f7c8f7_m.jpg
2007-09-24 16:30:13 · answer #7 · answered by DaveNCUSA 7 · 0⤊ 1⤋
gravity??
thats heavy man!!!
2007-09-24 16:32:20 · answer #8 · answered by helmut UK 3 · 0⤊ 0⤋
it looks exactly like the vapour from a pot of simmering pea soup
2007-09-24 16:28:17 · answer #9 · answered by only the truth 3 · 0⤊ 2⤋
gray
2007-09-24 16:28:26 · answer #10 · answered by less 6 · 0⤊ 2⤋