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Puzzle | Car and Helium Balloon motion

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  • Difficulty Level : Medium
  • Last Updated : 27 Dec, 2019


A Geek was in a car with a helium balloon on a string that is tied to the floor. The windows are closed. When she steps on the accelerator, what happens to the balloon: does it move forward, move backwards, or stay put?


  • When the car accelerates, the air is pushed backwards, just as your body is.
  • This sends a the Helium balloon, which is lighter than air, forward.
  • When the car brakes suddenly, the air piles up in front of the windshield.
  • This sends the balloon backwards.
  • Hence the Helium balloon moves in the direction of the acceleration of the car, i.e. and When the car moves backwards, the Helium balloon moves backwards.

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