Another Physics Question


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rcnixon
September 20, 2008, 08:36 PM
You are in a van, moving forward down the road. The van is sealed and no air is flowing through. In the back compartment of the van is a balloon filled with helium, tethered to the floor of the van by a single string. You hit the brakes firmly, suddenly slowing the van. Which way does the balloon move and why?

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Loosedhorse
September 20, 2008, 08:38 PM
No firearm, then I'm not playing. :mad:

kingjoey
September 20, 2008, 08:46 PM
The balloon (or any mass) should move forward relative to the vehicle. It would also move downward because the tether forces it to move in an arc rather than a line.

DaveBeal
September 20, 2008, 08:54 PM
When you hit the brakes, the air in the car moves forward due to its own inertia. As a result, the less dense helium balloon moves backward because it is displaced by the air. I've seen it happen.

Loomis
September 20, 2008, 09:06 PM
Depends on how heavy the tether is. Is there slack in the tether?

Sean Dempsey
September 20, 2008, 09:09 PM
I already shot the balloon so it basically stays where it is.

Thernlund
September 20, 2008, 09:12 PM
http://www.imnotaclown.com/images/gallery/gun-firing.JPG

IBTL.


-T.

Larry Ashcraft
September 20, 2008, 09:14 PM
Good topic for APS.

JShirley
September 20, 2008, 09:16 PM
There are only a few house rules:

1.) All topics and posts must be related to firearms or civil liberties issues.

Incidentally, I suggest those with nothing better to do than post the idiotic IBTL in threads find something.

John

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