Grade 6 - Test 2
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what poles does a magnet have?
south pole and north pole
unlike poles (bank)
attract
Like poles (blank)
Repel
name the metals attracted by magnets
Iron. Cobalt. Nickel
True or false, the earth is a giant magnet
true, it is as is a giant bar magnet goes through the centre of the earth
All matter is made up of (blank)
atoms
how are atoms arranged normally?
randomly
when iron, nickel, and cobalt atoms become magnetized, what happens to the atoms?
It causes their atoms to line up or align themselves
how can nickel, iron or cobalt atoms be magnetised?
by rubbing the object with a magnet which causes the atoms to line up
True or false: a magnet made this way is only temporary, eventually it will lose its magnetic ability
true
can permanent magnets lose their ability to lose their magnetism?
yes, if they are not handled properly (heated, dropped or knocked) this causes the atoms to become jumbled up and misaligned.
true or false: electricity can cause a magnetic effect
true
what is an electromagnet and how does it work?
the electricity from the battery causes the iron nail to act like a magnet and pick things up.
is an electromagnet temporary?
yes, it can be switched on and off.
how do maglev trains work?
they use magnetic levitation to float above a magnetized track which enables them to go extremely fast
what are the invisible lines revealed by the iron filings surrounding a magnet called?
A magnetic field
True or false: all metals are magnetic
false
which of these is magnetic: iron, plastic, aluminum, iron
iron
what happens if opposite poles are placed near eachother?
They attract
are neodymium magnets dangerous?
yes, their magetic force is so powerful they can crush things
which of these items do you NOT need to build an electromagnet? MAGNET WIRE NAIL BATTERY
magnet
true or false: magnets need to touch something to apply a force
false
what keeps plastic floating above a balloon?
they have the same charge
when you rub a balloon to your head your hair flies apart, why?
because each hair has the same charge