The above answer doesn't say why the strength of a magnet is affected by freezing it. I didn't know that magnets wereaffected by freezing - I can't see why they should be. Heat, now that's a different matter.
Move towards the U magnet so that the poles attach.
Jam/Jelly has no effect on the magnet or its magnetism, but it will cause the magnet to become sloppy and sticky.
you will freeze
Nothing - copper is not magnetic.
it becomes a magnet in it s own right with north and south poles
a magnet is a solid so you don't freeze it
the magnet gets weaker
get a choclate bar melt it place in a magnet shaped mold with bits of steel in it and cook and freeze
Move towards the U magnet so that the poles attach.
the nail goes to the magnet
Nothing happens, it does not attract.
It expands when you freeze it
Vegetable oil can't freeze.
it will loose its magnesium
the metal object becomes a temporary magnet
they bust
Nothing.