If you put a slinky on an escalator, will it go on forever?
107152
I love this question.\n\nI think if you could get the timing and length of steps right, it would go on as long as the escalator kept going.\n\nI don't think friction is a consideration because the escalator is continously adding energy.
418988
Energy cannot be created or destroyed- when the roller coaster is pausing before a fall, there is a tremendous amount of potential energy. When the rc falls, the PE gets turned into kinetic energy, so energy is never gained nor lost. the roller coaster will keep on moving until 1 or 2 of 2 things stops it: friction (brakes, air resistence, etc) or gravity, because an object in motion will remain at a steady velocity until acted upon by an outside force. that's all i can think of right now, and part of that isn't even involved in the 3 laws, sorry. ;)
721588
Oh let him follow you. He's just stalking you.  It could get dangerous...but what the hey.  Seriously, if you have to ask this question, I'm not sure the elevator goes to the top floor.
189282
I really like to use the row machine or the escalator like stairmaster for 15 minutes.  They get my heart rate up and my muscles warmed up nice.  Then, I usually run or the use the elliptical for 30 minutes and finish off with a 5 minute cool-down.
547508
No. \nThe system is static and the sum of the forces equal zero, but there definately are forces flowing through the bar.  Replace the bar with a piece of plastic and then what happens.  The system is no longer in equilbruim, becomes dynamic and the plastic gets torn to shreads.  The same would be true if say you used a piece of wire.  Just because something is not moving does not mean there are no forces flowing through it.
835380
Seems you need to know the time between steps.\ngravity is constantly pulling down but the steps are only a fraction of the time.\n\nSteps must counter the falling of the lizard and give some upward velocity. say ~4mg?
154209
It doesn't end.  It goes on. If you took a line and ran it in any direction off the planet's surface it would just keep going into infinity,  if you could freeze time and walk on that screen,  you would never get to the end.  There is no end.
420332
Gravity travels at the speed of light and is therefore inescapable. The force of gravity would eventually cause your device to quit moving. This might be an eternity but it would eventually stop. Sorry, but no arrangement of magnets and gravity will result in a perpetual motion device. The only thing you might ever consider a perpetual motion device is the entire universe itself and that in itself is debatable.
196769
I have a friend with a slinky.
1025041
It will continue to hover because the air that it's wings are beating against is moving at the same speed as the train. This of course is assuming that the premise requires that all windows are shut and the air is still.
98850
Yes. It will superheat and have a violent reaction when something touches it.
258401
No.  In theory, the cylinder will heat up indefinitely.  However it will likely melt or have imperfect insulation in the real world.\n\nCheck out Conduction of Heat in Solids by Carslaw and Jaeger.  It's a classic book with all of these solutions in it.
1106862
87 feet, according to this website:\nhttp://www2.gvsu.edu/~feenstrk/useless.html\n\nBut I don't know about that, since this website (which appears slightly more credible) says the longest slinky was 71 feet:\nhttp://www.firstpr.com.au/slinky/\n\nThis site says a slinky can be stretched to 15 feet without being deformed, but I don't know what that would be "fully stretched out":\nhttp://www.qsl.net/kd4cga/slinky.htm (This site also includes the history of the slinky)\n\nAnyways, I hope all that helps.\n\nWhat a random question!\n\n*EDIT*\nIt's true that it would depend greatly on the length of the particular slinky.  Different slinkies, different brands, different lengths.  I would go with Cerebrus' suggestion below.  It's a very good idea.
676832
YES\n===\nEverything is relative so in relation to some other object in space, yes it would be completely stopped as the train slowed down from the impact.\n\nNO\n==\nEverything in the universe is in constant motion.
454933
Yes, you will land in the same spot, but please be careful when you try that, don't slip on the floor after jumped in the air on a fast moving train. :-)
1011682
AS LONG AS YOU WANT THE STRING TO BE.
292639
as the table is frictionless a constant force will take it to infinity...... it will never stop....