You're sitting on a bus. The kid next to you has a helium-filled balloon and it ends up against the ceiling, just about in the center of the bus. The driver suddenly hits the gas pedal and the bus lurches forward, throwing you back into your seat. What does the balloon do?
a. It moves backwards.
b. It moves forward.
c. It stays where it is.
Continue reading for the correct answer.
The answer is (highlight): b. It moves forward. When the bus moves forward, the heavier air moves to the back of the bus. The helium balloon is lighter than air, so it is pushed forward. Give it try yourself sometime!
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via Neatorama http://www.neatorama.com/2013/03/12/Brainteaser-Balloon-on-a-Bus/
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