That's sweet!

Slow motion magnets, how do they work?

As the magnet falls it generates a current in the wall of the tube. Generating that current takes work to create so it slows the fall of the magnet (oversimplification of the interaction).

It works the opposite way as well. Drop a conductive tube through the center of a large magnet such as the kind used in MRI machines and it falls in slow motion. If the tube isn't conductive, it will fall at the normal rate of acceleration.

I once worked with a PhD engineer who designed and built an electromagnetic BB gun. But he couldn't get it to work. The BB's would roll out of the barrel with no force. When I saw the gun I knew the problem instantly. The copper plated steel BB became magnetized in the electromagnetic field when it was fired but the magnetism generated a current in the wall of the brass barrel as it moved. This slowed the rate of the projectile dramatically. He refused to believe me until one day I replaced the brass barrel with a glass tube and it worked perfectly.

This is gettin me pissed !!

NFA: Slow motion magnets, how do they work?

As the magnet falls it generates a current in the wall of the tube. Generating that current takes work to create so it slows the fall of the magnet (oversimplification of the interaction).

It works the opposite way as well. Drop a conductive tube through the center of a large magnet such as the kind used in MRI machines and it falls in slow motion. If the tube isn't conductive, it will fall at the normal rate of acceleration.

I once worked with a PhD engineer who designed and built an electromagnetic BB gun. But he couldn't get it to work. The BB's would roll out of the barrel with no force. When I saw the gun I knew the problem instantly. The copper plated steel BB became magnetized in the electromagnetic field when it was fired but the magnetism generated a current in the wall of the brass barrel as it moved. This slowed the rate of the projectile dramatically. He refused to believe me until one day I replaced the brass barrel with a glass tube and it worked perfectly.

Neat.

Also how magnetic braking works, if I recall.

I have the copper pipe. Now I just need the magnets so my wife can show this to her students at school.

NFA: Slow motion magnets, how do they work?

As the magnet falls it generates a current in the wall of the tube. Generating that current takes work to create so it slows the fall of the magnet (oversimplification of the interaction).

It works the opposite way as well. Drop a conductive tube through the center of a large magnet such as the kind used in MRI machines and it falls in slow motion. If the tube isn't conductive, it will fall at the normal rate of acceleration.

I once worked with a PhD engineer who designed and built an electromagnetic BB gun. But he couldn't get it to work. The BB's would roll out of the barrel with no force. When I saw the gun I knew the problem instantly. The copper plated steel BB became magnetized in the electromagnetic field when it was fired but the magnetism generated a current in the wall of the brass barrel as it moved. This slowed the rate of the projectile dramatically. He refused to believe me until one day I replaced the brass barrel with a glass tube and it worked perfectly.

Sounds like typical ivory-tower liberal elite intellectualism to me. What's your real agenda?

Could you design a skyscraper fire escape using this principle, where people strap on a magnet vest and jump into a tube?

/an idiot
//still, could you?
///or even a theme park attraction

Isn't this a repeat?

Does this work with any copper pipe and any magnet?

You need rare earth magnets which you can get here:

Link (new window)

Copper. downstairs: Does this work with any copper pipe and any magnet?

to a greater or lesser extent, but yes.

Yeah...my first project for the new year!

So that is why the mass driver I made out of a copper pipe didn't work. fark.

lokisbong: IronTom: Copper. downstairs: Does this work with any copper pipe and any magnet?

to a greater or lesser extent, but yes.

It will work with aluminum also.

It'll work with anything that is capable of conducting a current.

echri: so hell the hell are railguns made?? I find it hard to imagine that the barrels of those big ass railguns that are being mounted on battleships are made of glass...

Anything that doesn't conduct electricity will work--plastic, carbon fiber, shattered innocence...

the currents generate repulsive magnetic fields, that work against the changing magnetic fields of the moving magnet. farking wild.

quick, before the repeat turns into a delete, another Eddy vid where the copper is in the form of a huge plate ^