Wooden Rattleback
Wooden Rattleback
A rattleback is a type of spinning top that prefers to spin in one direction due to its unique semi-ellipsoidal shape.
When spun in the wrong direction, it will automatically shift momentum until it spins in the opposite direction. This is caused by an asymmetric mass distribution and the instability between the rotational axes.
As the mass shifts, the rolling axis compensates in the other direction, which in turn causes the mass to shift more. This continues until the top is spinning in the preferred direction. But when spun in the “right” direction, the mass needs no compensation.
The complex physics of these simple shapes can surprise even seasoned physics experts.
This Rattleback is an official product from @physicsfun.
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