Megnetism
what is a magnet?
an object with a magnetic field and 2 poles
what are magnets attracted to?
(3 materials...)
nickel, iron, conbalt
what are permanent magnets made of?
alloys
what is going on inside of a magnet? (that makes it a magnet)
the molecules are arranged in lines
how far is the north pole from true north?
not far at all, they're super close
what is a magnetic field?
the space around a magnet where there is a "force"
why is one of the poles of a magnet called "north"?
because it orients very closely to the geographic north pole
true or false" a magnets magnetic field is stronger the closer you are to the magnet
true
what is an electromagnet?
a temporary magnet that is only magnetic when an electric currents runs through it
what's a way you use magnets in everyday life?
(answers vary)
EARTH magnets
explain what is "magnetic" about animals/ humans
animals/ humans have teeny tiny magnetite "crystals" in their brains
when you put a north pole and north pole together (or south pole and south pole) the magnet _________
when you put a north pole and north pole together, the magnet REPELS
when you put a north pole and south pole together, the magnet _________
when you put a north pole and north pole together, the magnet ATTRACTS
what' does levitation mean?
float!
how does a mag lev train and track work?
(varied answer)
how fast does the fastest mag lev train go? (approximately)
over 600 kmh
why aren't mag lev trains more common around the world?
they're so darn expensive!
$$$$$$$$$$$$$
when a mag lev train hovers above the track, there is no FRICTION which allows the train to go insanely fast!
how do the magnets on your mag lev train need to be arranged?
all magnets on one side need to have north up, and all magnets on the other side need to have south up
___________ and ___________ are critical when designing a mag lev
WEIGHT and BALANCE are critical when designing a mag lev
what are 4 things around the room that are magnetic?
(Answers vary....)
can a magnet lose it's magnetism? if so, how?
Yes, when exposed to heat, strong electrical current, and high temperatures!
there is a small little magnet in it that always point north (or close to it) so if you know where north is you can find south, west and east too!
is the earth a strong or weak magnet?
it's actually pretty weak