welcome to the science of stupid Christmas grotto and as you can see we
Christmas grotto and as you can see we
Christmas grotto and as you can see we have spared literally no expense with
have spared literally no expense with
have spared literally no expense with the decorations but what would really
the decorations but what would really
the decorations but what would really make my Christmas would be to wake up on
make my Christmas would be to wake up on
make my Christmas would be to wake up on the big day – a fresh dusting of snow
the big day – a fresh dusting of snow
the big day – a fresh dusting of snow nothing beats that gentle caress of
nothing beats that gentle caress of
nothing beats that gentle caress of snowflakes on your face yeah in the
snowflakes on your face yeah in the
snowflakes on your face yeah in the right conditions that soft fluffy stuff
right conditions that soft fluffy stuff
right conditions that soft fluffy stuff that falls from the sky feels more like
that falls from the sky feels more like
that falls from the sky feels more like concrete but what if we stick to rolling
concrete but what if we stick to rolling
concrete but what if we stick to rolling our snowballs much more pleasant right
okay I think we’d better see some
okay I think we’d better see some science roll a snow ball down a hill and
science roll a snow ball down a hill and
science roll a snow ball down a hill and it gains mass as it picks up snow which
it gains mass as it picks up snow which
it gains mass as it picks up snow which compacts as it rolls making it denser
compacts as it rolls making it denser
compacts as it rolls making it denser the more mass or speed the snowball has
the more mass or speed the snowball has
the more mass or speed the snowball has the more momentum
the more momentum
the more momentum it’ll have if the snowball hits someone
it’ll have if the snowball hits someone
it’ll have if the snowball hits someone it’ll transfer some momentum to them as
it’ll transfer some momentum to them as
it’ll transfer some momentum to them as it loses momentum sorry but it’s the law
it loses momentum sorry but it’s the law
it loses momentum sorry but it’s the law of conservation of momentum now before
of conservation of momentum now before
of conservation of momentum now before we start rolling there is something else
we start rolling there is something else
we start rolling there is something else you should know about density freshly
you should know about density freshly
you should know about density freshly fallen snow is soft and fluffy but if it
fallen snow is soft and fluffy but if it
fallen snow is soft and fluffy but if it melts and rephrases some of it turns to
melts and rephrases some of it turns to
melts and rephrases some of it turns to ice which is just 8% less dense than
ice which is just 8% less dense than
ice which is just 8% less dense than water and just as heavy but rather more
water and just as heavy but rather more
water and just as heavy but rather more solid so you’ve got a mitt full of snow
solid so you’ve got a mitt full of snow
solid so you’ve got a mitt full of snow now for momentum find yourself a nice
now for momentum find yourself a nice
now for momentum find yourself a nice slope and roll away but please be
slope and roll away but please be
slope and roll away but please be careful
careful
careful believe it or not rolling one-ton
believe it or not rolling one-ton
believe it or not rolling one-ton snowballs can be very dangerous see what
snowballs can be very dangerous see what
snowballs can be very dangerous see what I mean more mass equals more momentum
now that one appears to have a lot less
now that one appears to have a lot less momentum but it’s increasing to about
momentum but it’s increasing to about
momentum but it’s increasing to about the same as a motorbike doing 22 miles
the same as a motorbike doing 22 miles
the same as a motorbike doing 22 miles an hour hmm
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