1.The battery for the engine to provide electricity, so that heavy objects to high-speed operation, the weight of the center of gravity is not in the middle of the heavy, It is not on the same straight line as the engine shaft.
2.In the rotation of the weight, it will always make the floor in the opposite direction of movement, which also caused the engine and the floor with a very high frequency of arc vibration, the tip will also be up and down vibration. When the pen tip leaves the paper, this arc vibration will cause the pen tip to continue to move.
3.If the pen tip does not vibrate like that up and down, the friction between the pen tip and the paper will prevent the movement from continuing.
4.Place two or three graffiti robots on the same piece of paper to see how they create more interesting patterns in “inspiring collisions”.
Helping kids to create patterns and know the basic mechanics,stimulating their creativity and innovation.
No Battery included.