Roll on the 20th June

[therealrasta]

Ok so Archer has left the building for one moth.... That doesn't mean that we should just lean back and wait for something to happen.

I recommend that we get to the testing of Archers magnetic gate with steel rod and ferrite block. We should also try to replicate BATMANs (IMHO) very successful rail.
I will do some experiments tomorrow and will post the videos. But you guys should also try to test some designs.
Together we can move the world.

BR,
Frenky

What a month.. damn.. I thought it would only be a week..

[spinner]

........
I place a magnet a few inches from the start of the table which is offset from the path the ball will take enough so that the ball would just miss the magnet by a few millimeters and I perform the same test.  One ball does exactly the same as before and moves all the way to the end of the table but the other one gets caught in the field of the magnet, is attracted and stops.

The question I have is where did the energy in the ball which would have been expended by the ball reaching the end off the table actually go when the ball stops after being attracted to the magnet just after starting the run ?

The kinetic energy of a rolling ball mostly ends up (assuming this ball gets stucked with the magnet at the end) kinetic impact (actualy, several of them..) with the fixed magnet/supporting mass, according with the conservation of momentum principle.

Of course, all known magnetic effects are playing it's role, too. Rolling ball & magnet are interacting by Faraday's induction, eddy currents, Lenz effect, "usual" magnetization of an iron ball (constant deorientation of magnetic domains), magnetocaloric effect, ... Think about Faraday's disk, and compare it with a rolling ball approaching a magnet.

So, looking from the outside, most of this energy gets converted to heat (magnet&ball), magnetization of an iron ball, while a small part is simply radiated away (EM,IR,sonic...)

Cheers!

[futuristic]

What a month.. damn.. I thought it would only be a week..

Well I could be wrong... I thought I read somewhere that it will be a month.

[bullsnbears1]

Well.. I am gonna just rip some ferrite out of a few transformers and see whats up with those ferrite cores. Got a shit load of pc power supplies laying around that bit the dust.


edit -- a lot of trouble and they suck.. So don't bother with that.

Thanks for the heads up, I was just heading for the closet to do some pc power supply demo work!

[exxcomm0n]

Ok so Archer has left the building for one moth.... That doesn't mean that we should just lean back and wait for something to happen.
I recommend that we get to the testing of Archers magnetic gate with steel rod and ferrite block. We should also try to replicate BATMANs (IMHO) very successful rail.
I will do some experiments tomorrow and will post the videos. But you guys should also try to test some designs.
Together we can move the world.
BR,
Frenky

@ futuristic

Amen brotha!

<snip>
First one
Assume I have two perfectly identical metal balls and two identical tables of exactly the same length, any length but let's say it's a few meters. I place the balls at the front of each table and push both of them with enough force to make them reach the very end of the table where they both stop. Given what I know and ignoring the 'chaos' factor both balls will do exactly the same thing.
I place a magnet a few inches from the start of the table which is offset from the path the ball will take enough so that the ball would just miss the magnet by a few millimeters and I perform the same test.  One ball does exactly the same as before and moves all the way to the end of the table but the other one gets caught in the field of the magnet, is attracted and stops.
The question I have is where did the energy in the ball which would have been expended by the ball reaching the end off the table actually go when the ball stops after being attracted to the magnet just after starting the run ?

@ MrM

I'd think (always a scary situation) that the energy (unless great enough to counter) is, for lack of a better word, "eaten" by the magnetic attraction given that it is now of that much less force than the attraction "pull grade" of the mag.
But the area of that attraction is so small and the effect happens so fast, it's very difficult to gauge any difference with the eye.
A high speed camera filming the run would be invaluable as to capture the effect quickly enough that it could be slowed down and seen.

If it is of appreciably more force, the metal ball would not succumb to the magnetic attraction, but I bet both it's direction and velocity would suffer for the cost of escaping magnetic attraction drag.

I have to throw my opinion in as being directly opposite of Rusty's as depending on where the metal ball enters the mag field, it will have a direct relation as to whether ball velocity is added or taken away from the speed of magnetic attraction.