>> I meant more that I wouldn't have expected to be able to just 
>> completely disregard 3/4 the weight of the object just because I'm 
>> only looking at one wheel.
> 
> Why not? Try doing some one-handed push-ups and see if they are not 
> harder to do than two-handed ones.

When I become able to do two-handed push-ups, I'll let you know. ;-)

>>>> So... what the hell is the thickness of a tin can then?
>>>  0.2 mm or thereabouts.
>>
>> ...my God. You can make metal that thin?? o_O
> 
> Surely you are joking.
> 
> http://en.wikipedia.org/wiki/Aluminium_foil

Damn. I thought that stuff was plastic with a metal-powder coating...

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