science Flashcards
(72 cards)
magnet
any object that attracts the metal iron
magnetic pole
a place on a magnet where the force it applies is strongest
magnetic force
a force of attraction or repulsion between the poles of two magnets
attraction
when opposite poles of two magnets are near each other the resulting magnetic field applies a force of attraction
repulsion
when two like poles of two magnets are near each other the resulting magnetic field applies a force of repulsion
what does an invisible magnetic field do
surrounds all magnets, it is this magnetic field that applies forces on other magnets
what do iron fillings do
form a pattern of curved lines that reveal the magnet’s magnetic field
how can a magnets magnetic field be represented
lines, called magnetic field lines
where is the magnetic force the strongest
magnetic poles (where the lines are closest together)
how do the field and force become weaker
when the field lines become farther apart
what happens to the magnetic fields around two bar magnets that are brought together
the two fields combine and form one new magnetic field
how to the magnets repel
if similar poles of two magnets such as north and north or south and south are Brough near each other the magnets repel
what happens if the North Pole of one magnet is Brought near the South Pole of another magnet
the two magnets attract (the magnets will pull together)
similar poles _____, opposite poles _____
repel, attract
how does a magnetic force become stronger
as magnets move closer together
how does a magnetic force become weaker
as magnets move father apart
there are two magnetic poles on all magnets. what are they
North Pole and south pole
what happens when magnetic fields combine
they form field lines with different patterns
what do the new patterns (of field lines) depend on
whether the magnets are attracting or repelling each other
why does earth have a magnetic field
due to molten iron and nickel in its outer core
like magnets earth has what
north and south magnetic poles
a compass needle doesn’t point directly towards what
the poles of a magnet
What do the needles of a compass align with
the field lines and points in the direction of the field lines
How do auroras occur
a magnetic field surrounds earth. sometimes large numbers of particles from the sun travel along earth’s magnetic field lines and concentrate near the magnetic poles. There the particles collide with atoms of gases in the atmosphere causing the atmosphere to glow
