Newtons law?

Question

What goes up, must come down. If we discover life on another planet, is this law still true. We might go up and never come down again? I think it should be "What comes down, must go up again"?

Answer 1

Roy S is correct.

Newton's law of gravtitation applies every where in the same way. Any two objects with mass have a gravitational force running between them "proportional to the mass of each and varies inversley as the square of the distance between them". The gravitational constant remains constant.

The force on the moon is less than the force on the earth because the moon has less mass than the earth (in accordance with the law). So if we discover life on another planet then its still going to have gravity, weaker or stronger than earth, but still gravity.

Now I suppose it could be a really small planet so as to not produce enough of a gravitational pull to stop you jumping off it. In this case you would go "up" (away from the gravitational pull) and float into space ("not go down"). But:

- That will never reverse, you won't land on any object and be repelled (what goes down must go up again)
- Any planet small enough for you to jump off it is unlikely to support life and
- If Pluto isn't a planet your little planet isn't going to get called one.

Answer 2

It is possible. In order to discover such a planet, we need to overcome the gravitational force of own Earth first. Gravity, according to Newtonian Physics, is the property of matter; it is a force by which all material objects attract one another towards each other. So if anything material goes up on the Earth it will eventually come down - long as it does not go too fast too far up into space to be caught up by the gravitational force of another planet, like the Jupiter.

Now, if we discover another planet, somewhere in the universe, where instead of gravity the ruling force is human spirit - a force that gets things done. According to the laws of this spirit everything that goes down always comes up and everything that is pushed behind will eventually come forward. That would be a new world, with its own Sir. Isaac Newton. I call it Spirit Planet.

Suppose we have done it, we have found such a planet in a remote part of a distance galaxy. And that we can get there in not time at all – thanks to the latest advancement in our travel technology. Now, what is life like upon the Spirit Planet?

I would say it is very interesting and really uplifting. As the spirit people live slightly uplifted, I mean literally lifted above the ground. They can settle above the ground level without any wings at the height of a normal building on the Earth. They build house there and go for walks closer to clouds further above etc. They are safe from floods and earthquakes that's for sure, but they have to make effort to up their feet on the ground and keep them there while working. They have to mine and cultivate land for the purpose of agriculture etc. But no sooner do they stop making efforts than they get lifted back upwards again according to laws science of the Planet Spirits, leaving all their work undone below them. Then they have to try yet again the following day to get their feet on the ground – or to back to work. They will also have to invest extra amount of work to rise above the normal level of residence if decide to do so.

Answer 3

Newton's laws apply to motion. What does that have to do with another planet with life? Other than the gravitational constant being different, and atmospheric pressure and some other things, the laws of motion would still apply. Inertia, momentium and forces acting on a body would still act in the same manner, but with differing magnitudes than we expereince here on Earth, unless, of course, we happened to find a exact twin of Earth...

Answer 4

If the gravitational laws did not apply everywhere then the universe would come apart.
It's gravity that keeps the planets moving round the sun rather than shooting off into space for example.
Now for the funny - Apples fall off trees stalk side up. If you hold an apples stalk side down does it float away?!
RoyS.

Answer 5

I think Newton was around before space travel was a reality!

As a general law I think it still holds... but all laws should be revised from time to time.

Also... What exactly is Up and Down in the Universe... Hmmm???

;-)

Answer 6

Sorry, but I do not agree
To go up implies that there must be a force of some kind involved and if there is one force there must be an oposing force or the world could not exist, everything would fall off of it.

Answer 7

which law ? if we apply the first, it doesnt follow that what goes up will inded ever come down, unless a force acts upon it itll travel in a straight line. the second, itll travel in a straight line, until something interacts with it, and casues it to change direction, and the third...the opposite and equal action thingy, or push me shove you..

or maybe its what goes around..goes around...could we apply the law to Sh*t rolls downhill...

good question... and if it comes down, how did it get there in the first place?

Answer 8

well, gravity doesnt apply to most other planets the way it does here...so lets just stick with what goes up must come down, eh?

Answer 9

dependas on the planet

Answer 10

I think it should be "What goes up."....