BF2S Forums Would the earth move?

Ok everyone, talked to my mate again and he said that the phrase...

"Every action has and equal and oppsite reaction"

is an oversimplified version only suitable for GCSE/High School physics.  The actual law is a lot more complex and I'd adavise you read it before referencing it again.

Newton's 3rd law of motion...
"LAW III: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts. -- Whatever draws or presses another is as much drawn or pressed by that other. If you press a stone with your finger, the finger is also pressed by the stone. If a horse draws a stone tied to a rope, the horse (if I may so say) will be equally drawn back towards the stone: for the distended rope, by the same endeavour to relax or unbend itself, will draw the horse as much towards the stone, as it does the stone towards the horse, and will obstruct the progress of the one as much as it advances that of the other. If a body impinge upon another, and by its force change the motion of the other, that body also (because of the equality of the mutual pressure) will undergo an equal change, in its own motion, toward the contrary part. The changes made by these actions are equal, not in the velocities but in the motions of the bodies; that is to say, if the bodies are not hindered by any other impediments. For, because the motions are equally changed, the changes of the velocities made toward contrary parts are reciprocally proportional to the bodies. This law takes place also in attractions, as will be proved in the next scholium."

lol

Liberal-Sl@yer wrote:

There doesnt need to be friction my little lizard. The earth is held in place by gravitational and magnetic forces. Any force under a humungeous force, like a colliding planet, would do diddle squat to effect the earths current position.

No, because any force would be in addition to already existing forces, altering the equilibrium currently in place.

EstebanRey:  That whole paragraph is just a description of what is meant by the phrase.  That is to say: it isn't that it's any different, it's just an explanation for people who don't know what it means.  That is exactly what anyone who's done Physics for VCE units 1 & 2 could tell you (Aussie year 11, year 12 is units 3 & 4, after that it's tertiary education).

lol yes i am remember my friend had this idea also. but all i have to say is if it does work: "YOUR a jerk! now earth is @#$ up and we're going to die. "

I also thought of something.

Since the Earth is spherical, and you would have alot of people on one side of the Earth jumping at the same time as the people on the other side, the planet might just squish and get smaller.

But still, 80% or so of the Earth is water, so the jumping effect would be completely uneven. This is because we are jumping on the land, not on the ocean as well.

Haha, and at worldjumpday.org, the temperature went down 0.09 degrees when the people jumped.
The solution to global warming!

Last edited by Ryan (2007-05-19 11:35:14)