Magnets as Brakes? | I Didn’t Know That

now magnets are everywhere there in

now magnets are everywhere there in computers televisions hi-fi’s fans

computers televisions hi-fi’s fans

computers televisions hi-fi’s fans washing machines stereo equipment tape

washing machines stereo equipment tape

washing machines stereo equipment tape players absolutely everywhere right down

players absolutely everywhere right down

players absolutely everywhere right down to the humble fridge magnet and they

to the humble fridge magnet and they

to the humble fridge magnet and they vary in scale enormous leap from the

vary in scale enormous leap from the

vary in scale enormous leap from the microscopic right up to the planetary

microscopic right up to the planetary

microscopic right up to the planetary that’s right folks we’re sitting on the

that’s right folks we’re sitting on the

that’s right folks we’re sitting on the biggest magnet of all the earth itself

biggest magnet of all the earth itself

biggest magnet of all the earth itself so what is a magnet well a magnet is

so what is a magnet well a magnet is

so what is a magnet well a magnet is defined as any object that attracts iron

defined as any object that attracts iron

defined as any object that attracts iron and produces an external magnetic field

and produces an external magnetic field

and produces an external magnetic field and as you probably learnt at school the

and as you probably learnt at school the

and as you probably learnt at school the regions at the end of a magnet where the

regions at the end of a magnet where the

regions at the end of a magnet where the external magnetic fields are strongest

external magnetic fields are strongest

external magnetic fields are strongest accord the poles and every magnet has to

accord the poles and every magnet has to

accord the poles and every magnet has to one north and one south and the first

one north and one south and the first

one north and one south and the first law of magnetism is that opposite poles

law of magnetism is that opposite poles

law of magnetism is that opposite poles attract while the same poles repel and

attract while the same poles repel and

attract while the same poles repel and because the earth is one big magnet if

because the earth is one big magnet if

because the earth is one big magnet if you suspend a simple bar magnet within

you suspend a simple bar magnet within

you suspend a simple bar magnet within the Earth’s magnetic field it will

the Earth’s magnetic field it will

the Earth’s magnetic field it will naturally orientate itself north to

naturally orientate itself north to

naturally orientate itself north to south and this is exactly how a compass

south and this is exactly how a compass

south and this is exactly how a compass works it’s been discovered that homing

works it’s been discovered that homing

works it’s been discovered that homing pigeons have got a naturally occurring

pigeons have got a naturally occurring

pigeons have got a naturally occurring magnetic mineral in their beaks called

magnetic mineral in their beaks called

magnetic mineral in their beaks called magnetite this makes them sensitive to

magnetite this makes them sensitive to

magnetite this makes them sensitive to the Earth’s magnetic field and helps

the Earth’s magnetic field and helps

the Earth’s magnetic field and helps with their navigation one of the

with their navigation one of the

with their navigation one of the surprising things about magnetism is its

surprising things about magnetism is its

surprising things about magnetism is its relationship to electricity did you know

relationship to electricity did you know

relationship to electricity did you know for example you can generate an electric

for example you can generate an electric

for example you can generate an electric current using a magnet now underneath

current using a magnet now underneath

current using a magnet now underneath this tape is copper wire wrapped around

this tape is copper wire wrapped around

this tape is copper wire wrapped around this copper tube and if I drop a magnet

this copper tube and if I drop a magnet

this copper tube and if I drop a magnet through the tube it generates an

through the tube it generates an

through the tube it generates an electric current in the wire which will

electric current in the wire which will

electric current in the wire which will light up these LEDs

this process is called electromagnetic

this process is called electromagnetic induction and perhaps one of the most

induction and perhaps one of the most

induction and perhaps one of the most surprising applications of

surprising applications of

surprising applications of electromagnetic induction can be found

electromagnetic induction can be found

electromagnetic induction can be found on the powerful brakes used on some

on the powerful brakes used on some

on the powerful brakes used on some fairground rides

the brake system of this awesome theme

the brake system of this awesome theme park ride is totally reliant on magnets

park ride is totally reliant on magnets

park ride is totally reliant on magnets Sol rich let’s get it over with or

Sol rich let’s get it over with or

Sol rich let’s get it over with or either this ride is brilliant in its

either this ride is brilliant in its

either this ride is brilliant in its simplicity the two-ton cars are winched

simplicity the two-ton cars are winched

simplicity the two-ton cars are winched to the top of the 60 meter tower by

to the top of the 60 meter tower by

to the top of the 60 meter tower by powerful electric motors right come on

powerful electric motors right come on

powerful electric motors right come on we can do it and boy is it a long way up

like all magnets the magnets in the drop

like all magnets the magnets in the drop car produced their own magnetic fields

car produced their own magnetic fields

car produced their own magnetic fields they’re shown here in red as the car

they’re shown here in red as the car

they’re shown here in red as the car Falls at 22 m/s it passes these copper

Falls at 22 m/s it passes these copper

Falls at 22 m/s it passes these copper fins and the falling motion across these

fins and the falling motion across these

fins and the falling motion across these fins creates an electric current which

fins creates an electric current which

fins creates an electric current which in turn creates its own magnetic field

however this field is equal and opposite

however this field is equal and opposite to the field created by the magnets in

to the field created by the magnets in

to the field created by the magnets in the drop car the effect of these

the drop car the effect of these

the drop car the effect of these opposing magnetic fields is so powerful

opposing magnetic fields is so powerful

opposing magnetic fields is so powerful it brings the car to a halt

it brings the car to a halt

it brings the car to a halt it’s called eddy currents braking and

it’s called eddy currents braking and

it’s called eddy currents braking and it’s amazing

it’s amazing

it’s amazing and the only thing stops

and the only thing stops

and the only thing stops you