"funkyoldcortina" wrote in message
...
On 08/09/10 12:19, stuart noble wrote:
On 08/09/2010 11:30, Pete Zahut wrote:
would this work http://www.wimp.com/wineshoe

It's a video of someone removing a cork from a wine bottle using a shoe.
The
cork comes out of the bottle but I don't see how - although I'm not the
world's greatest physicist, of course :-) IMHO the cork, if it moves at
all, should go inside the bottle because (and this is the bit that
justifies
it being in a DIY group) it would seem to be the same principle as
putting a
hammer head on a shaft, ie, shaft and head travelling downwards, shaft
stops, head carries on downwards and fits snugly on shaft. Wine bottle
and
cork travelling in same direction, bottle stops, cork should continue
same
way as the bottle, not go in the opposite direction - shouldn't it?



Seems like the cork, being lighter, gets left behind somehow. We've got a
couple of physics grads on here, so I'm sure an answer will soon be
forthcoming.

GCSE physics. Newton's Laws. Every action has an equal and opposite
reaction. Same reason newton's cradle works.

Bottle in shoe hits wall. Newton's second law tells us force=mass x
acceleration. Wall doesn't move and exerts equal and opposite force on
shoe. Shoe then exerts that force on bottle. Bottle then exerts that force
on wine. Wine exerts that force on cork. Cork will then move out roughly
the same distance that the base of the bottle sunk into the insole of the
shoe.

Something like that anyway!

Or more simply: the wine bounces back and nudges the cork?

mark