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Science > Grade 6 - Test 2 > Flashcards

Grade 6 - Test 2 Flashcards

1
Q

what poles does a magnet have?

A

south pole and north pole

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2
Q

unlike poles (bank)

A

attract

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3
Q

Like poles (blank)

A

Repel

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4
Q

name the metals attracted by magnets

A

Iron. Cobalt. Nickel

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5
Q

True or false, the earth is a giant magnet

A

true, it is as is a giant bar magnet goes through the centre of the earth

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6
Q

All matter is made up of (blank)

A

atoms

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7
Q

how are atoms arranged normally?

A

randomly

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8
Q

when iron, nickel, and cobalt atoms become magnetized, what happens to the atoms?

A

It causes their atoms to line up or align themselves

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9
Q

how can nickel, iron or cobalt atoms be magnetised?

A

by rubbing the object with a magnet which causes the atoms to line up

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10
Q

True or false: a magnet made this way is only temporary, eventually it will lose its magnetic ability

A

true

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11
Q

can permanent magnets lose their ability to lose their magnetism?

A

yes, if they are not handled properly (heated, dropped or knocked) this causes the atoms to become jumbled up and misaligned.

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12
Q

true or false: electricity can cause a magnetic effect

A

true

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13
Q

what is an electromagnet and how does it work?

A

the electricity from the battery causes the iron nail to act like a magnet and pick things up.

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14
Q

is an electromagnet temporary?

A

yes, it can be switched on and off.

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15
Q

how do maglev trains work?

A

they use magnetic levitation to float above a magnetized track which enables them to go extremely fast

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16
Q

what are the invisible lines revealed by the iron filings surrounding a magnet called?

A

A magnetic field

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17
Q

True or false: all metals are magnetic

A

false

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18
Q

which of these is magnetic: iron, plastic, aluminum, iron

A

iron

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19
Q

what happens if opposite poles are placed near eachother?

A

They attract

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20
Q

are neodymium magnets dangerous?

A

yes, their magetic force is so powerful they can crush things

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21
Q

which of these items do you NOT need to build an electromagnet? MAGNET WIRE NAIL BATTERY

A

magnet

22
Q

true or false: magnets need to touch something to apply a force

A

false

23
Q

what keeps plastic floating above a balloon?

A

they have the same charge

24
Q

when you rub a balloon to your head your hair flies apart, why?

A

because each hair has the same charge

25
Q

when a balloon sticks to you, why?

A

you and the balloon have the opposite charge

26
Q

True or false: when iron nickel or cobalt enter a magnetic field they become magnetic themselves

A

true

27
Q

what other way can you magnetize something?

A

if you take magnetic material and rub it against a magnet this is known as magnetization

28
Q

name materials not attracted to magnets

A

copper brass silver and aluminum

29
Q

is steel magnetic?

A

yes because it is made up mostly of iron

30
Q

can copper brass silver and aluminum be made magnetic?

A

slightly if placed in a magnetic field

31
Q

true or false: plastic and wood are magnetic or can be magnetized

A

false

32
Q

name the relationship between electrons and magnets

A

a magnet has a unique electron arrangement, the electrons face one direction that creates two poles.

33
Q

how can some materials be converted temporarily into magnets?

A

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.

34
Q

give real life examples of where electromagnets are used

A

generators, magnetic locks, motors

35
Q

why were electromagnets invented?

A

they can be controlled, turned on and off and they can have the force increased or decreased,

36
Q

connection between electricity and electromagnets

A

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

37
Q

what are lodestones?

A

magnetic stones found in the earth

38
Q

two materials not attracted to magnets

A

coppper and aluminum

39
Q

two materials most likely to make up the core of the earth

A

iron and nickel

40
Q

what is a compass

A

it has a magnetic pointer that pulls to the earths north pole and helps people navigate

41
Q

name household items that use magnets

A

refrigerator, TV, spakers, microphone, vacuum

42
Q

what happens if you cut a magnet in half?

A

each smaller piece gets a north and south pole

43
Q

the word magnet in ancient greek means

A

stone from magnesium

44
Q

fields allow some objects to exert forces on eachother even when they are not…..

A

touching

45
Q

examples of fields?

A

magnetic, gravitational, and electrical

46
Q

the north pole is always attracted to the ….

A

south pole

47
Q

positive charges are always attracted to…..

A

negative charges

48
Q

what happens to the force when two magnets get closer together?

A

gets stronger

49
Q

how can you increase the strength of an electromagnet?

A

more coils (wire)

50
Q

how is an electric field generated

A

with electricity

Science (7 decks)

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