Science of Stupid (2014) s08e15 Episode Script
Towing, Swinging and Tumbling.
1
DALLAS (off-screen): This
is the Science of Stupid.
Yes, this is the show that
gleans scientific wisdom
from sheer stupidity.
Observe as adults
and future adults
take on the power of physics
and come off second best.
We'll reveal what went wrong
and why
with the help
of scientific principles
such as buoyancy,
angular velocity,
and centrifugal force.
So, watch but never
imitate because this
is the Science of Stupid.
In this episode,
we'll be examining
the stability of towed boats,
getting to grips
with pendulums,
and looking at torque
in water skiing.
WOMAN: Bend your knees!
DALLAS (off-screen):
But first this.
The electric light,
the telephone, the microchip,
all great inventions but for
me the most important of all
was the wheel, mainly because
it led to things like this.
Downhill cycling
and why use two wheels
when one makes you
look twice as cool?
But before you even think
about pulling off
a downhill wheelie
be aware that
even on two wheels.
(screams)
It can still be perilous.
What makes downhill cycling
such a terrifying pursuit
is that the bike isn't only
powered by the cyclist's legs
but also by our
old friend gravity.
When a cyclist goes up
a hill he gradually gains
gravitational
potential energy.
When he descends this
gravitational potential energy
can be converted over
a very short period of time
into a terrifying amount
of kinetic energy.
If the rider falls,
that kinetic energy
might be converted
into heat via friction,
or if they stopped suddenly
dissipated by deformation.
So, energy is never destroyed,
it's merely transferred
into something else
like kinetic energy,
heat, or even the sound
of an impact,
which is often accompanied
by the sound of screaming.
To investigate
we sent out some of our more foolhardy researchers.
This guy has made a deal with
gravity and built up a lot of
kinetic energy, so much so
that he's able to pass cars,
except that one.
The cyclist is unable to
transfer enough kinetic energy
into heat via
friction at his brakes.
When he hits the car his
remaining kinetic energy is
transferred into sound,
heat and dissipated via
deformation, also
known as bouncing off.
Don't worry, he was okay.
Alright, let's
try a gentler pace.
This is more like it,
a chance to take in the scenery.
And his friend's bottom.
He appears to make no attempt
to reduce his kinetic energy
and his linear momentum
becomes angular momentum as he
rotates around the
axle of the front wheel.
MAN: Oh dear,
first crash of the holiday.
DALLAS (off-screen):
And maybe not the last.
Perhaps it's safer to go
downhill on three wheels with
these drift trikes.
Or maybe not.
It's just as well our drift
trike gang are heading home
on four wheels.
It may be safer just to walk.
Water skiing is hard,
water skiing bare foot is even
harder but water skiing bare
foot whilst performing tumble
turns, well that's better left
to experts like Greg Sample.
Yup, we're turning our back
on failure for a moment to
celebrate brilliance
and it doesn't
get much more
brilliant than
Greg from the US.
He's attempting a
Guinness World Record title
for the most barefoot
tumble turns in one minute
and 33 is a new world record.
Oh, Greg's let himself go.
Greg makes it look easy but
then he's put in the time and
the practice.
Alas, for every Greg there's
a load of wannabe record
breakers who feel
they don't need to.
Let's see if they're right.
(screams)
Nope, I didn't think so.
Attempting to water ski
bare foot can be painful,
so if you're lucky enough to
own a boat please don't try
this without proper
instruction but how do the
pros like Greg pull
off that perfect tumble?
The skier angles his feet
up deflecting the water
downwards, which creates an
equal and opposite reaction
force pushing him up.
There's a torque,
or turning effect,
generated from the distance
between the pull of the boat
and hydrodynamic drag
from the water at his feet.
Bending the knees helps absorb
the impact of any bumps in the
water and keeps the center of
mass safely behind the feet to
produce enough torque in
the opposite direction to
counteract the turning effect.
To perform the tumble turn he
shifts the handles so the pull
from the rope is to the side
of the drag from the water,
generating a torque
that spins him around.
So, equal and opposite
forces, Newton's Third Law,
hydrodynamic drag and
torque are all key to breaking
this record.
But just getting on the
water is also fairly important.
MAN: Go, go.
DALLAS (off-screen): Let's go to
the next wannabe record breaker.
MAN: Woo-hoo.
DALLAS (off-screen): This lady
has enough speed to create a
reaction force to keep her up
but she's forgotten one key
bit of science.
WOMAN: Bend your knees!
Bend your knees!
DALLAS (off-screen):
That's the one.
With her knees locked she
can't react to the bumps in
the water so her feet dig in
and a sudden increase in drag
turns her linear momentum
into a face plant.
WOMAN: Bend your knees!
DALLAS (off-screen): Now
she's been paying attention,
she's got her legs bent
and we're looking good.
Of course, whilst attempting
an energy-sapping tumble turn
it's important
to keep hydrated.
But it's even more important
to A, not drink beer whilst
bare foot skiing and B, focus
on what you're doing so you
don't end up accidentally
dipping your toes in and
getting a sudden increase
in drag from the water.
She did get hydrated
though, by the lake.
Our last challenger is
deflecting the water well,
that has a good body posture.
It's tumble turn time.
There's the sort of turn.
And that's
definitely a tumble.
That turn won't
win any prizes,
then when he transfers his
weight back onto his feet too
fast the drag from the water
combined with the pull from
the rope makes him
flip but full marks
for trying to hang on.
I think Greg's
record is safe for now.
This guy is showing off his
best hydro jet moves but can
you guess the
scientific principle
he is about to demonstrate?
DALLAS (off-screen): Now, did
you guess the science this man's
hydro jet display would lead to?
That's right, it's thrust.
The water coming out of the
jet nozzle produces an equal
and opposite
force known as thrust,
this keeps him in the air but
when he holds onto the railing
the rail acts as a pivot
and the thrust rotates him.
(screams)
Oh, science you rogue.
When I was a lad we
didn't have games consoles,
the Internet or basically
anything good but what we
could always rely on for
entertainment was some old
rope and a tree.
What more could
you possibly want?
Well, someone to push
you was always a bonus.
Take it away, Dad.
My dad was like that too.
Aside from pushy dads there
are other things we need to
consider in order to get the
most out of a tree swing.
The swing and swinger
combine to form a pendulum.
The swinger's mass and velocity
means they have momentum.
This is greatest at the bottom
of the swing where they're
traveling the fastest.
The swinger's momentum applies
more downwards force to the
tree swing than the force
of their weight alone.
If the total force exceeds the
flexural strength of either
the seat or the branch, or
their center of mass falls
outside their base of support,
gravity could get its way.
So, while more momentum equals
more fun it also equals more
potential for pain.
Let's see if our
researchers have done their
science homework.
Being fixed at a single point
allows the tire swing to act
like a three-dimensional
pendulum swinging her
in all directions.
Including into the treehouse.
The rope intersects with the
corner of the tree house,
tilting the tire
putting her center of mass
outside her base of support.
Perhaps it's best to swing
without someone pushing.
MAN: Hashtag
bring down the broom.
MAN (off-screen): Bring down
the house. Whoa. Oh, yeah. Oh.
DALLAS (off-screen): Hashtag try
to avoid additional passengers.
In this experiment it was the
mass and downwards momentum of
the extra swinger that
overcame the flexural strength
of the branch,
causing it to snap.
That branch looks sturdy and
her friends are merely there
to help her demonstrate how
the momentum she gains will be
effected by the
height she swings from.
MAN: One more for luck.
WOMAN: Oh my God. Oh!
DALLAS (off-screen): Well,
that's cleared that up.
Near the top of the swing
she had little momentum,
by the bottom she had lots
and whilst the branch she was
swinging from was sturdy, the
branch she was sitting on was
basically a twig.
So, the best idea is to avoid
all that momentum and find a
nice sturdy place to sit down,
like the ground.
Solubility is a measurement of
how much of a substance will
dissolve in a given
volume of liquid.
If a substance
dissolves it's soluble,
if it doesn't it's insoluble.
Some examples.
The sugar in their cake mix
is soluble in water and will
blend in but her hair is not
soluble and will not blend in.
And he isn't soluble
either, no matter how much
they mix him.
Okay, why are some things
soluble while others aren't?
Well, a substance's
molecular polarity is key.
Sugar is soluble in water,
this is because both water
molecules and sugar
molecules are polar,
meaning they have a difference
in charge across them,
thus are attracted
to each other.
So, the water molecules form
intermolecular bonds with the
sugar molecules separating
them from each other so that
the sugar eventually
becomes too small to see.
Polystyrene comprises
of non-polar molecules,
it's not soluble in water but
it is soluble in similarly
non-polar solvents,
like this acetone.
A substance's solubility
can have a dramatic impact,
for example where water
dissolves soluble bed rock
underneath roads.
Which may have been the
cause of this sink hole
and from car eating
holes to a salt eating man.
The positive and negative ions
in salt are attracted to the
polar water molecules
in his soup,
so they dissolve and disappear
unlike the revolting taste.
But solubility can be a life
saver for this young artist.
MAN: Explain to Mom.
WOMAN: Wait, what happened?
BOY: Um.
DALLAS (off-screen): Quick, think kid. Think.
BOY: The monster
did this last time.
DALLAS (off-screen): Perfect.
MAN: See if it
will come off the wall.
DALLAS (off-screen): Luckily
for the monster this paint is
water based so it can form
intermolecular bonds with
water molecules and will wash
off with a little scrubbing.
Did you know that a little
solubility knowledge can come
to the rescue if you
swallowed a hot chili?
Drinking water doesn't
actually help because
capsaicin, the chemical
that makes chilies hot,
is insoluble in water
therefore the water
can't wash it away.
So, what can?
MAN: One, two, three.
DALLAS (off-screen): Well,
let's say you were to munch on
an extremely potent
and potentially dangerous
ghost chili.
You'd experience
this kind of thing.
MAN: Help me!
It's gone up my nose
and my nose is burning.
DALLAS (off-screen): Now,
milk contains a substance
which dissolves the capsaicin
and helps wash it away.
MAN: It's getting worse.
DALLAS (off-screen): Okay, it
hasn't worked yet but sometime
soon hopefully and that was
your lesson in solubility,
and some things.
MAN: Ghost chili.
DALLAS (off-screen): You should never ever do.
MAN: Ah see you later.
DALLAS: Now, I love a bit
of boating but I don't love
getting the boat to the water
because boats are large,
awkwardly shaped objects
not designed for road travel.
Unless your boat
is a car, of course.
MAN: Don't see that every day.
DALLAS (off-screen): No.
And that's because
most boats aren't cars.
They're boats and towing one
to the water in a car can lead
to all sorts of
science-infused issues.
Boats can be quite heavy and
can have a high center of mass
when put on a trailer.
When you turn a corner
centrifugal force acting on
that relatively high center of
mass can generate a sizeable
turning effect.
If the base of support,
the trailer's wheels,
is insufficient this turning
effect will be enough to lift
the inside wheel and cause
the boat and trailer to roll.
So, science learnt.
Let's examine the three stages
to make it to the water.
Stage one, before setting
off make sure your boat
is properly attached
to your vehicle.
Did I mention it was
heavy in the science?
Stage two,
watch out
for hidden obstacles.
Hitting a pot hole causes
the trailer to swing sideways
and that high center of mass tips
beyond the base of support.
And finally, stage three.
MAN: There it goes.
DALLAS (off-screen):
Use an appropriate trailer.
MAN: What did I tell you?
DALLAS (off-screen): I think
you were probably telling us
that on a corner
the centrifugal force
creates a turning effect
which the base of support
of the trailer
is nowhere near wide
enough to resist.
Luckily, the inflatable
side of the boat
causes it to bounce back.
MAN: Oh, that is awesome.
DALLAS (off-screen):
No, it's science.
Since the dawn of time humans
have liked to show off their
strength and there are few
better tests of might than the
aptly named muscle up.
All you need is a bar.
Available at all decent
children's playgrounds.
Some technique
does help though.
While you don't have
to take your top off
to perform a muscle up,
it does require
a lot of upper body strength,
in fact the most
consecutive muscle ups
on a bar is only 26.
Right, let's get
down to the science.
First, he needs a good grip
on the bar
which has enough material
strength to support him.
Once on a pendulum motion
called "kipping"
gives the body
a little momentum,
followed by
an explosive contraction
of the shoulder's
lat muscles
accelerating the body upwards.
While the body
has upward momentum,
the hands move
into a new position
and the triceps
and the front shoulder muscles
contract to lift the body
until the arms
are fully extended.
He then uses his muscles
for a controlled descent.
Basically, there are a lot
of muscles involved,
we sent our strongest
researchers out
to test the science.
This lifter has
just enough strength
for a clumsy muscle up.
It's just unfortunate
he didn't spot the fan.
He starts off okay
but pauses once up,
meaning he doesn't use
his upwards momentum
for the second part
of the lift
and probably wishes
he'd given up at that point.
Perhaps it's best to perform
muscle ups somewhere
with plenty of head room.
Like outside.
He's got enough momentum
with his kipping
and up he goes.
And down he goes.
He's got a great technique
but it's the lack
of material strength
of the fixing at the side
that's let him down.
Let's raise the bar a little
and try the rings.
MAN (off-screen):
Turnover. Yeah.
DALLAS (off-screen): The rings
are even harder than the bar.
The flexibility of the rings
provides little resistance
so his wrists
rotate 180 degrees.
MAN (off-screen): Yeah.
DALLAS (off-screen): Making
this more of a muscle down.
Okay, let's get back
on the bar
and lower it.
That looks painful,
sounds painful too.
And that's it, that's all the
science we've got time for
but as astrophysicist
Neil deGrasse Tyson once said,
"The good thing about science
is that it's true whether or not you believe in it,"
and these guys
prove he's right.
♪
♪
Captioned by
Cotter Captioning Services
DALLAS (off-screen): This
is the Science of Stupid.
Yes, this is the show that
gleans scientific wisdom
from sheer stupidity.
Observe as adults
and future adults
take on the power of physics
and come off second best.
We'll reveal what went wrong
and why
with the help
of scientific principles
such as buoyancy,
angular velocity,
and centrifugal force.
So, watch but never
imitate because this
is the Science of Stupid.
In this episode,
we'll be examining
the stability of towed boats,
getting to grips
with pendulums,
and looking at torque
in water skiing.
WOMAN: Bend your knees!
DALLAS (off-screen):
But first this.
The electric light,
the telephone, the microchip,
all great inventions but for
me the most important of all
was the wheel, mainly because
it led to things like this.
Downhill cycling
and why use two wheels
when one makes you
look twice as cool?
But before you even think
about pulling off
a downhill wheelie
be aware that
even on two wheels.
(screams)
It can still be perilous.
What makes downhill cycling
such a terrifying pursuit
is that the bike isn't only
powered by the cyclist's legs
but also by our
old friend gravity.
When a cyclist goes up
a hill he gradually gains
gravitational
potential energy.
When he descends this
gravitational potential energy
can be converted over
a very short period of time
into a terrifying amount
of kinetic energy.
If the rider falls,
that kinetic energy
might be converted
into heat via friction,
or if they stopped suddenly
dissipated by deformation.
So, energy is never destroyed,
it's merely transferred
into something else
like kinetic energy,
heat, or even the sound
of an impact,
which is often accompanied
by the sound of screaming.
To investigate
we sent out some of our more foolhardy researchers.
This guy has made a deal with
gravity and built up a lot of
kinetic energy, so much so
that he's able to pass cars,
except that one.
The cyclist is unable to
transfer enough kinetic energy
into heat via
friction at his brakes.
When he hits the car his
remaining kinetic energy is
transferred into sound,
heat and dissipated via
deformation, also
known as bouncing off.
Don't worry, he was okay.
Alright, let's
try a gentler pace.
This is more like it,
a chance to take in the scenery.
And his friend's bottom.
He appears to make no attempt
to reduce his kinetic energy
and his linear momentum
becomes angular momentum as he
rotates around the
axle of the front wheel.
MAN: Oh dear,
first crash of the holiday.
DALLAS (off-screen):
And maybe not the last.
Perhaps it's safer to go
downhill on three wheels with
these drift trikes.
Or maybe not.
It's just as well our drift
trike gang are heading home
on four wheels.
It may be safer just to walk.
Water skiing is hard,
water skiing bare foot is even
harder but water skiing bare
foot whilst performing tumble
turns, well that's better left
to experts like Greg Sample.
Yup, we're turning our back
on failure for a moment to
celebrate brilliance
and it doesn't
get much more
brilliant than
Greg from the US.
He's attempting a
Guinness World Record title
for the most barefoot
tumble turns in one minute
and 33 is a new world record.
Oh, Greg's let himself go.
Greg makes it look easy but
then he's put in the time and
the practice.
Alas, for every Greg there's
a load of wannabe record
breakers who feel
they don't need to.
Let's see if they're right.
(screams)
Nope, I didn't think so.
Attempting to water ski
bare foot can be painful,
so if you're lucky enough to
own a boat please don't try
this without proper
instruction but how do the
pros like Greg pull
off that perfect tumble?
The skier angles his feet
up deflecting the water
downwards, which creates an
equal and opposite reaction
force pushing him up.
There's a torque,
or turning effect,
generated from the distance
between the pull of the boat
and hydrodynamic drag
from the water at his feet.
Bending the knees helps absorb
the impact of any bumps in the
water and keeps the center of
mass safely behind the feet to
produce enough torque in
the opposite direction to
counteract the turning effect.
To perform the tumble turn he
shifts the handles so the pull
from the rope is to the side
of the drag from the water,
generating a torque
that spins him around.
So, equal and opposite
forces, Newton's Third Law,
hydrodynamic drag and
torque are all key to breaking
this record.
But just getting on the
water is also fairly important.
MAN: Go, go.
DALLAS (off-screen): Let's go to
the next wannabe record breaker.
MAN: Woo-hoo.
DALLAS (off-screen): This lady
has enough speed to create a
reaction force to keep her up
but she's forgotten one key
bit of science.
WOMAN: Bend your knees!
Bend your knees!
DALLAS (off-screen):
That's the one.
With her knees locked she
can't react to the bumps in
the water so her feet dig in
and a sudden increase in drag
turns her linear momentum
into a face plant.
WOMAN: Bend your knees!
DALLAS (off-screen): Now
she's been paying attention,
she's got her legs bent
and we're looking good.
Of course, whilst attempting
an energy-sapping tumble turn
it's important
to keep hydrated.
But it's even more important
to A, not drink beer whilst
bare foot skiing and B, focus
on what you're doing so you
don't end up accidentally
dipping your toes in and
getting a sudden increase
in drag from the water.
She did get hydrated
though, by the lake.
Our last challenger is
deflecting the water well,
that has a good body posture.
It's tumble turn time.
There's the sort of turn.
And that's
definitely a tumble.
That turn won't
win any prizes,
then when he transfers his
weight back onto his feet too
fast the drag from the water
combined with the pull from
the rope makes him
flip but full marks
for trying to hang on.
I think Greg's
record is safe for now.
This guy is showing off his
best hydro jet moves but can
you guess the
scientific principle
he is about to demonstrate?
DALLAS (off-screen): Now, did
you guess the science this man's
hydro jet display would lead to?
That's right, it's thrust.
The water coming out of the
jet nozzle produces an equal
and opposite
force known as thrust,
this keeps him in the air but
when he holds onto the railing
the rail acts as a pivot
and the thrust rotates him.
(screams)
Oh, science you rogue.
When I was a lad we
didn't have games consoles,
the Internet or basically
anything good but what we
could always rely on for
entertainment was some old
rope and a tree.
What more could
you possibly want?
Well, someone to push
you was always a bonus.
Take it away, Dad.
My dad was like that too.
Aside from pushy dads there
are other things we need to
consider in order to get the
most out of a tree swing.
The swing and swinger
combine to form a pendulum.
The swinger's mass and velocity
means they have momentum.
This is greatest at the bottom
of the swing where they're
traveling the fastest.
The swinger's momentum applies
more downwards force to the
tree swing than the force
of their weight alone.
If the total force exceeds the
flexural strength of either
the seat or the branch, or
their center of mass falls
outside their base of support,
gravity could get its way.
So, while more momentum equals
more fun it also equals more
potential for pain.
Let's see if our
researchers have done their
science homework.
Being fixed at a single point
allows the tire swing to act
like a three-dimensional
pendulum swinging her
in all directions.
Including into the treehouse.
The rope intersects with the
corner of the tree house,
tilting the tire
putting her center of mass
outside her base of support.
Perhaps it's best to swing
without someone pushing.
MAN: Hashtag
bring down the broom.
MAN (off-screen): Bring down
the house. Whoa. Oh, yeah. Oh.
DALLAS (off-screen): Hashtag try
to avoid additional passengers.
In this experiment it was the
mass and downwards momentum of
the extra swinger that
overcame the flexural strength
of the branch,
causing it to snap.
That branch looks sturdy and
her friends are merely there
to help her demonstrate how
the momentum she gains will be
effected by the
height she swings from.
MAN: One more for luck.
WOMAN: Oh my God. Oh!
DALLAS (off-screen): Well,
that's cleared that up.
Near the top of the swing
she had little momentum,
by the bottom she had lots
and whilst the branch she was
swinging from was sturdy, the
branch she was sitting on was
basically a twig.
So, the best idea is to avoid
all that momentum and find a
nice sturdy place to sit down,
like the ground.
Solubility is a measurement of
how much of a substance will
dissolve in a given
volume of liquid.
If a substance
dissolves it's soluble,
if it doesn't it's insoluble.
Some examples.
The sugar in their cake mix
is soluble in water and will
blend in but her hair is not
soluble and will not blend in.
And he isn't soluble
either, no matter how much
they mix him.
Okay, why are some things
soluble while others aren't?
Well, a substance's
molecular polarity is key.
Sugar is soluble in water,
this is because both water
molecules and sugar
molecules are polar,
meaning they have a difference
in charge across them,
thus are attracted
to each other.
So, the water molecules form
intermolecular bonds with the
sugar molecules separating
them from each other so that
the sugar eventually
becomes too small to see.
Polystyrene comprises
of non-polar molecules,
it's not soluble in water but
it is soluble in similarly
non-polar solvents,
like this acetone.
A substance's solubility
can have a dramatic impact,
for example where water
dissolves soluble bed rock
underneath roads.
Which may have been the
cause of this sink hole
and from car eating
holes to a salt eating man.
The positive and negative ions
in salt are attracted to the
polar water molecules
in his soup,
so they dissolve and disappear
unlike the revolting taste.
But solubility can be a life
saver for this young artist.
MAN: Explain to Mom.
WOMAN: Wait, what happened?
BOY: Um.
DALLAS (off-screen): Quick, think kid. Think.
BOY: The monster
did this last time.
DALLAS (off-screen): Perfect.
MAN: See if it
will come off the wall.
DALLAS (off-screen): Luckily
for the monster this paint is
water based so it can form
intermolecular bonds with
water molecules and will wash
off with a little scrubbing.
Did you know that a little
solubility knowledge can come
to the rescue if you
swallowed a hot chili?
Drinking water doesn't
actually help because
capsaicin, the chemical
that makes chilies hot,
is insoluble in water
therefore the water
can't wash it away.
So, what can?
MAN: One, two, three.
DALLAS (off-screen): Well,
let's say you were to munch on
an extremely potent
and potentially dangerous
ghost chili.
You'd experience
this kind of thing.
MAN: Help me!
It's gone up my nose
and my nose is burning.
DALLAS (off-screen): Now,
milk contains a substance
which dissolves the capsaicin
and helps wash it away.
MAN: It's getting worse.
DALLAS (off-screen): Okay, it
hasn't worked yet but sometime
soon hopefully and that was
your lesson in solubility,
and some things.
MAN: Ghost chili.
DALLAS (off-screen): You should never ever do.
MAN: Ah see you later.
DALLAS: Now, I love a bit
of boating but I don't love
getting the boat to the water
because boats are large,
awkwardly shaped objects
not designed for road travel.
Unless your boat
is a car, of course.
MAN: Don't see that every day.
DALLAS (off-screen): No.
And that's because
most boats aren't cars.
They're boats and towing one
to the water in a car can lead
to all sorts of
science-infused issues.
Boats can be quite heavy and
can have a high center of mass
when put on a trailer.
When you turn a corner
centrifugal force acting on
that relatively high center of
mass can generate a sizeable
turning effect.
If the base of support,
the trailer's wheels,
is insufficient this turning
effect will be enough to lift
the inside wheel and cause
the boat and trailer to roll.
So, science learnt.
Let's examine the three stages
to make it to the water.
Stage one, before setting
off make sure your boat
is properly attached
to your vehicle.
Did I mention it was
heavy in the science?
Stage two,
watch out
for hidden obstacles.
Hitting a pot hole causes
the trailer to swing sideways
and that high center of mass tips
beyond the base of support.
And finally, stage three.
MAN: There it goes.
DALLAS (off-screen):
Use an appropriate trailer.
MAN: What did I tell you?
DALLAS (off-screen): I think
you were probably telling us
that on a corner
the centrifugal force
creates a turning effect
which the base of support
of the trailer
is nowhere near wide
enough to resist.
Luckily, the inflatable
side of the boat
causes it to bounce back.
MAN: Oh, that is awesome.
DALLAS (off-screen):
No, it's science.
Since the dawn of time humans
have liked to show off their
strength and there are few
better tests of might than the
aptly named muscle up.
All you need is a bar.
Available at all decent
children's playgrounds.
Some technique
does help though.
While you don't have
to take your top off
to perform a muscle up,
it does require
a lot of upper body strength,
in fact the most
consecutive muscle ups
on a bar is only 26.
Right, let's get
down to the science.
First, he needs a good grip
on the bar
which has enough material
strength to support him.
Once on a pendulum motion
called "kipping"
gives the body
a little momentum,
followed by
an explosive contraction
of the shoulder's
lat muscles
accelerating the body upwards.
While the body
has upward momentum,
the hands move
into a new position
and the triceps
and the front shoulder muscles
contract to lift the body
until the arms
are fully extended.
He then uses his muscles
for a controlled descent.
Basically, there are a lot
of muscles involved,
we sent our strongest
researchers out
to test the science.
This lifter has
just enough strength
for a clumsy muscle up.
It's just unfortunate
he didn't spot the fan.
He starts off okay
but pauses once up,
meaning he doesn't use
his upwards momentum
for the second part
of the lift
and probably wishes
he'd given up at that point.
Perhaps it's best to perform
muscle ups somewhere
with plenty of head room.
Like outside.
He's got enough momentum
with his kipping
and up he goes.
And down he goes.
He's got a great technique
but it's the lack
of material strength
of the fixing at the side
that's let him down.
Let's raise the bar a little
and try the rings.
MAN (off-screen):
Turnover. Yeah.
DALLAS (off-screen): The rings
are even harder than the bar.
The flexibility of the rings
provides little resistance
so his wrists
rotate 180 degrees.
MAN (off-screen): Yeah.
DALLAS (off-screen): Making
this more of a muscle down.
Okay, let's get back
on the bar
and lower it.
That looks painful,
sounds painful too.
And that's it, that's all the
science we've got time for
but as astrophysicist
Neil deGrasse Tyson once said,
"The good thing about science
is that it's true whether or not you believe in it,"
and these guys
prove he's right.
♪
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Captioned by
Cotter Captioning Services