Grade 6 - Test 2 Flashcards
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
when a balloon sticks to you, why?
you and the balloon have the opposite charge
True or false: when iron nickel or cobalt enter a magnetic field they become magnetic themselves
true
what other way can you magnetize something?
if you take magnetic material and rub it against a magnet this is known as magnetization
name materials not attracted to magnets
copper brass silver and aluminum
is steel magnetic?
yes because it is made up mostly of iron
can copper brass silver and aluminum be made magnetic?
slightly if placed in a magnetic field
true or false: plastic and wood are magnetic or can be magnetized
false
name the relationship between electrons and magnets
a magnet has a unique electron arrangement, the electrons face one direction that creates two poles.
how can some materials be converted temporarily into magnets?
if you take magnetic material and rub it against a magnet. also if iron, nickel or cobalt enter a magnetic field thy become magnetic too.
give real life examples of where electromagnets are used
generators, magnetic locks, motors
why were electromagnets invented?
they can be controlled, turned on and off and they can have the force increased or decreased,
connection between electricity and electromagnets
magnets run on electricity and lose their magnetism when the electricity is no longer flowing, when electricity is flowing it rearranges the molecule of the nail making it magnetic. the strength of the electromagnet can be increased by increasing the strength of the battery
what are lodestones?
magnetic stones found in the earth
two materials not attracted to magnets
coppper and aluminum
two materials most likely to make up the core of the earth
iron and nickel
what is a compass
it has a magnetic pointer that pulls to the earths north pole and helps people navigate
name household items that use magnets
refrigerator, TV, spakers, microphone, vacuum
what happens if you cut a magnet in half?
each smaller piece gets a north and south pole
the word magnet in ancient greek means
stone from magnesium
fields allow some objects to exert forces on eachother even when they are not…..
touching
examples of fields?
magnetic, gravitational, and electrical
the north pole is always attracted to the ….
south pole
positive charges are always attracted to…..
negative charges
what happens to the force when two magnets get closer together?
gets stronger
how can you increase the strength of an electromagnet?
more coils (wire)
how is an electric field generated
with electricity
