What if...
 Fred |
 Lilly |
„So the behaviour of the objects in the car can be explained by inertia.“
„Right, it is termed inertia of the mass. All bodies move on in the same direction and retain their speed until they are compelled to execute another movement by an external force.“
„The brake force also acts on all things that are connected firmly with the car. In contrast, there is no force acting on loose objects. Therefore they do not change their movement and roll, glide or fly towards the front window.“
