saxon51 Posted November 29, 2003 Share Posted November 29, 2003 I suppose it could be demonstrated using a lit cigarette. The smoke rising being less dense than the air, would (should) behave similarly. I agree with other forum folk in that the air in the car would move forward on braking and drag any object lighter than it forwards with it. The balloon containing the helium has the same mass inflated as deflated so should behave accordingly (shouldn't it?) by moving forwards initially. I'm not a scientist, but I'll have a go at justifying this. HERE GOES. A helium-filled balloon in air resembles an object floating in water. If the container is suddenly brought to a halt the water carries on in the direction it was moving momentarily and takes the object with it. Well that's my twopennuth of dodgy science. I'm off to complete my studies on time travel now. Link to comment Share on other sites More sharing options...
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