how many kids will it take to lift a ton
of water experimental and how much slack
is there in our bungee cord
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experimental
welcome to experimental The Knockout
competition to find the country's
sharpest science sharks there are two
teams intellectually beating their
brains out this week in the red from
never Green School in Sheffield we have
Jonathan Jack in and in Green from
Oswald Road School in Manchester we have
jck Aron Nathan those are the
teams don't have to be a rocket
scientist to understand the rules we'll
show both teams the beginning of an
experiment then using Smart Sense and
science they have to predict the
experiment's outcome now they will have
the appropriate experimental equipment
and the help the knowledge of our
science analysis Matrix Sam any thoughts
Sam only two things are certain the
universe and human stupidity Otis and
are not certain about the universe it's
a good job I'm not human then wait a
minute anyway on with the first
experiment outside this here research
lab is our testing ground and it's there
that we join Chief experimental Holly
Willoughby welcome to the experimental
testing ground now this is rocket
science what we have here are three sets
of rockets a single rocket two rockets
strapped together and two rockets stra
one behind the other all the Rockets are
identical and contain equal amounts of
gunpowder your challenge is to work out
which pair of rockets will go the
furthest and exactly how far will they
go now to give you a clue her's going to
set the single rocket off
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now rocket went
11.1 M so that's back to
you okay guys that is your challenge and
your experimental time starts now for
safety reasons the teams cannot fire
rockets in the lab but they can get
similar results by releasing balloons
along strings okay Jonathan how far did
the first balloon go 2 m 31 CM lovely
okay I'm about to release the twin set
of balloons now here we
go ow okay Nathan how far did that go 3
m 26 CM releasing the tandem
balloons and the booster rocket in three
two
one
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okay iner how far did that go 3 m 30 cm
okay
together Sam what is it they need to do
here because I mean a balloon is not a
rocket right one rocket carries its own
weight two rockets together twice the
power but twice the weight tandem
Rockets they lose weight as the first
rocket Falls
away
okay teams your time is up team captains
your predictions
please the tandem rocket 15.85 7 m
tandem rocket 15.87 M okay then let's
see how their answers tie into reality
Holly right Otis the area is now secured
and for safety reasons the Rockets will
be fired electrically and in charge of
ignition is our resident technician
Herby oh Herby not now it's time to
start the countdown on the rockets that
are strapped together so in five 4 3 2
1 right Herby fire the next pair of
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rockets
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[Applause]
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right what was really interesting about
that experiment was that the rockets
that were strapped one on top of the
other W virtually the same distance as a
single rocket and yet the rockets that
was strapped one behind the other went
further in fact they went a massive 12.4
M right now percentage accuracy equals
points after the first round our green
team was 72% accurate but the Reds were
73%
accurate now one child can easily lift
one bucket of water but the challenge
facing our teams today is to try and
calculate how many members of our
observation team it will take to lift
one ton of water that's the same weight
as a baby elephant or a small car teams
your test time starts
now the teams are starting by
determining how much one person can lift
with the help of buckets on a
now Sam I know that 1 liter of water
weighs 1 kg but where do you go from
there the teams can measure how much one
person can lift but will it accurately
reflect how much a group of people can
lift especially if they are using their
legs rather than their
arms
EAS is it two maybe or two and a half we
can't have half a
person look I'm there 2 * 10 is 20 20
and 1,00 /
20 but some people might able to carry
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more all right teams time is up captains
your predictions
please 40
people 48 people okay let's see how
their Theory ties in with reality we
have our observation team here ready to
attempt to lift one ton we have 24 in
place at the moment okay guys ready
lift and down okay that was a failed
attempt we're going to add another eight
we now have 32 members in place okay
guys you ready
lift ooh not quite there we're going to
going to add another eight taking it
from 32 to 40 remember guys you're all
lifting from the knees keeping your back
straight are you ready
lift oh we're still having a problem
picking it right up let's add another
eight everybody Shuffle
forward 3 two one
lift and
down okay that's the result it took 48
members of by observation team to lift
one ton of
water the red team were 83% accurate
given them a total of 156 points but the
greens were 100% accurate giving them a
leading score of
172 so with the green team currently in
the lead let's join Holly from Panic
stun hery always Keen to demonstrate his
athletic skill is going to help us with
our next experiment oh Herby I told you
to switch off that invisible force field
now we're going to need another
stuntman wellcome
J
J not only has Jos got a fight against
air resistance but he also has to fight
against his own physical limitations of
which I can assure you there are none he
also has a bungee cord attached to his
back so the challenge facing our teams
is to work out how far Jos will get
before he is whipped
away okay teams that's your challenge
how far can Jos run before the bungee
cord pulls him back your test time
starts
now to test the elasticity of rubber the
teams have set up improvised stretching
experiments using rubber bands and
spring balances
quite frankly I'm confused what's the
setup here the stretchiness of the cord
affects how much force is exerted in the
opposite direction to the
pull Joss's bungee cord is twice as
stretchy as the teen's elastic
band so Sam ever ever considered a Bundy
jump
unlike you humans like you Otis I am not
stupid and I would not want to burst my
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bubbles look
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it okay time's up your predictions
please 7.41 m 6.44 m okay let's see how
calculations tie in with reality
Holly Jos is in position the bungee
called to connected so ready steady
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go
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okay Otis just managed to get 8.4 M now
that's nearly as impressive as
here the Reds were 88% accurate in that
round giving them a grand total of 244
points the greens were 77% accurate but
it was just enough to give them the
victory with 249
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points that means green are today's
winners putting them in second place on
our
leaderboard the top two teams on our
leaderboard at the end of the series
will battle it out in the Grand Final
but right now the green team has an
opportunity to increase their score by
predicting the outcome of the fourth and
final stunt The Fabulous Furniture fling
a
th
our final game gives the winning team a
chance to bump up their points spit but
simply guessing how far this nitrogen
Cannon can flame Furniture there's quite
a selection out there but as always the
choice goes to our observational team
right observation team which Furniture
gets flung next choose
now
right while Herby loads the Wardrobe
onto the furniture flinger I'd like to
remind you of a third member of our team
our resident crash test dummy Gerald now
Gerald suffered a bit of an ny knock
last week but he does assure me that
he's really looking forward to this
week's Furniture fling aren't you
Gerald so guys how far would a ram throw
the Wardrobe you have 10 seconds
starting now our last fling was a toilet
which weighed slightly less and offered
less air resistance than the Wardrobe
that went 24.5 m
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okay guys time's up let me know your
guess 20.5 M an educated guess but how
close was it
Holly the Wardrobe is now loaded Gerald
is in position the whole area has been
cleared for safety reasons so Herby let
her
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rip
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point that them in second place but will
they still be there next time make sure
you join us when another two teams will
be taking a sideways glance at science
with a blazing fuse and a barrel of
gunpowder a mini tornado right here in
our studio and Gerald the crash test
dummy sinking like a see you next
time