Why is gravity weak enough so we can move and strong enough to keep us on the ground?

Answer 1

Becuase GOD has made the earth in order that human live on it...

Answer 2

It's not that gravity is 'weak'. This is a misconception. Gravity is very strong. However, gravity is also very dilute. The strong nuclear force governs within the atom. Gravity however, governs attractions on intergalactic scales.

The strength of Gravity is also dictated by the ammount of energy a system contains. Therefore, the strength of gravity isn't always the same...not even close. Gravity is a consequence of energy in space time . You can make gravity very weak or very strong.

Now use your logic to figure out why gravity appears so weak.



To actually answer the question, gravity is weak enough so we can move but strong enough to keep us on the ground because of our distance from the sun, the size of the sun and the size of the earth. All of those factors play a key role.


If you want to see the true strength of gravity, take a trip into a blackhole and you'll see what gravity can really do ;) Oh wait, you'll be annihilated into energy and spewed hawking radiation instantly, crushed by a gravitational force so strong not even light itself can escape its pull.

Answer 3

It should be understood that Gravity works between two massive objects, namely the earth and me. Because it can be said to act on a straight line between me and the earth, it does not inhibit my motion in other directions, like forward, backwards, side, side, etc, except when calculating the ammount of work necessary for things and the ammount of friction experienced. In an ideal sense, gravity doesnt really directly inhibit movement. In a non-ideal sense, if gravity were huge, you couldnt get up, so movement would be a pain in the butt.

Answer 4

Not a single correct answer - shame on you all.

The trick in this answer is in understanding what you mean by "we can move around". And by this you mean things like walking. But when we walk we only move our centre of mass a few centimetres up and down, so the change in gravitational energy involved is tiny - mhg where m is our mass, g is 10, and h is those few centimetres.

If, instead, by move around you chose to mean move to the moon you will find that gravity is pretty strong and you need great big things like rockets.

Of course, if gravity were a stronger force - like say the electrostatic force - then you would need a great deal of energy to move your centre of mass up and down by even a few mm.

Answer 5

gravity is actually a very weak force, we break it every day, but as to why we don't go floating away, it's the only thing exerting a steady pull on us, if a 10 quadriollion cubic kilometer chunk of lead came floating through space close enough we'd all lose weight...or gain weight...depending on which side of the earth yer on from it, or we may actually go floating away or become one with the rocks.

Answer 6

Because of coincidence. Not very coincidential though, you can move on lots of other planets but not escape it. Because Earth is a PLANET, and its gravitational pull (and mass) cannot be too weak or it will be an asteroid and cannot be too strong. How strong/weak do you want a planet to be?

Answer 7

Gravity is pretty much fixed - it's us that have adapted and evolved in its environment. Much like asking why the average temperature on the earth is warm enough to sustain life?

Answer 8

Becuase we exist. Really, if the earth wasn't big enough have gravity strong enough to hold us to the ground, then we probobley wouldn't have life here.

Answer 9

gravity is due to the earth's mass, and as y its strong enuff to keep us on the grd, in the first place if it cant life wld not start on dis planet. and as for y we can move ard, its cos we evolve frm dis planet and grow accustom to it, kinda evolution makes us adapt to it.. ya if i were to put a family their decends may not b able to walk ard in earth's gravity

Answer 10

Very interesting question to ponder. I don't know the answer but I wonder how much stronger are weaker it would have to be to prevent movement or cause floating. I will have to ponder this later, as for now I am tired.

Answer 11

Because we evolved on this planet. Go to the moon, and the situation is somewhat different.