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1 month ago
Fast Pinewood Derby Car 2008 Scout Race
His last year racing in Cub Scouts ..............................
......Now visit .....www.p-d-d-r.com 
psilobla
commented:
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3 months ago
Mars Science Laboratory (Curiosity Rover) Mission Animation
This artist's concept animation depicts key events of NASA's Mars Science Laboratory mission, which will launch in late 2011 and land a rover, Curi...
psilobla
commented:
@ubergossen Incorrect, there is sound in space. Just not very much. Space is not a total vacuum.
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@bbrownrigg: "The less surface area touching the track, the less friction caused at point of contact." This is incorrect, even if it feels right. Static friction (which is what this rolling friction is) = the normal force * k. (k is a constant that depends on the surfaces) This does not depen...