We collect a set of constructors for launching balls | Marble run race

Gravity, body inertia and magnetic field for kids Marble run race.
With the help of gravity, the ball rolls down, gaining speed. Gravity is the ability of one body to attract another. At the end, we will show it with an example.
The higher the descent, the faster the body will move.
The ball does not stop immediately when gaining speed. But it travels a certain distance and can even climb up. This phenomenon is called inertia.
We have brought to your attention magnetic balls that clearly show the interaction with each other. Although they do not touch, they interact with each other, then connect, then repel each other.