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Lazy balloon

Max has been given a balloon filled with helium at a fair. During the journey home he holds the floating balloon with the string. On the back shelf there is Max's football, which he has not put away yet after the practice of yesterday. Suddenly his Dad has to brake hard. What happens with the football and the balloon?


There are some hints for the solution behind the buttons on the right side. Choose one of them! You can also work on several hints consecutively.

Helpful hints
Inertia everywhere
Experiments in a water pot.
What if
Lilly and Fred think about the events in the car.

Why does a helium balloon fly...
and an air balloon not?

That may help you...
In the toolbox you can find important physical basics and useful facts.
"I've got it!"...
...and I would like to answer the question.