Video: Simple test with balloons breaking the laws of physics

Normally when traveling on an accelerating car, the occupant will be pulled back, while if the car brakes quickly, the stifling person will be pushed forward. It is an inertial phenomenon, it applies to all objects placed on the car except a balloon.

>>>Video: Scientific experiment for 70 years

In the video above we can see that a balloon is attached to the floor of the mini truck, when the car accelerates, instead of being pushed back the ball is too forward. And when the car brakes the ball is pushed back. Completely contrary to the inertia phenomenon we already know.

It seems that this phenomenon completely abolished this law of physics and is illogical, but if we look more carefully we can explain this phenomenon. The key point is that the inertial force depends on the mass.

So can you explain this phenomenon?