A rattleback is a semi-ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles" to a stop and reverses its spin to the preferred direction. For most rattlebacks the motion will happen when the rattleback is spun in one direction, but not when spun in the other.

2020年11月25日 · 凯尔特石 (Celtic stone) 的得名源于十九世纪考古学家对欧洲和埃及史前石器的发现。根据它的运动特征，也被称为抖退石 (rattleback) 或振动石 (wobblestone)。在北美和欧洲，凯尔特石是理工科大学力学实验室常见的演示教具。各种凯尔特石玩具在市场出售（图1）。

Rattlebacks are semi-ellipsoidal tops that have a preferred direction of spin (i.e., a spin-bias). If spun in one direction, the rattleback will exhibit seemingly stable rotary motion. If spun in the other direction, the rattleback will being to wobble and subsequently reverse its spin direction.

The rattleback (also known as the Celtic stone, or wobble stone) is a fascinating object. You spin it in one direction, it slows down, wobbles, and then starts spinning in the opposite direction! Check out a video of a rattleback: The counter-intuitive behaviour of the rattleback is difficult to explain in a physics sense.

2019年9月1日 · Rattlebacks are semi-ellipsoidal tops that have a preferred direction of spin (i.e., a spin-bias). If spun in one direction, the rattleback will exhibit seemingly stable rotary motion. If spun in the other direction, the rattleback will being to …

The rattleback is a top that defies convention. It spins freely in one direction, but if spun in the other direction, its rotational motion becomes unstable; it starts to wobble and then will begin to spin in the opposite direction. In this regard, the rattleback seems to defy the physical law of conservation of angular momentum.

How Does a Rattleback Work? A quick explanation for the classic physics toy, the Rattleback™. The Rattleback takes the shape of an elongated asymmetrical semi-ellipsoid – a squashed sphere cut in half horizontally – with a flat top.

2012年2月29日 · The Rattleback is a very popular science toy shown to students all over the world to demonstrate the non-triviality of rotational motion. When spun on a horizontal table, this boat-shaped object behaves in a peculiar way. Although the object appears symmetric, the dynamics of its motion seem very asymmetric.

2017年9月12日 · The rattleback is a boat-shaped top with an asymmetric preference in spin. Its dynamics can be described by nonlinearly coupled pitching, rolling, and spinning modes. The chirality, designed into the body as a skewed mass distribution, manifests itself in the quicker transition of +spin → pitch → −spin than that of −spin → roll → +spin.

2020年8月1日 · The rattleback, also known as the celtic stone (or simply, the celt), is a rigid semi-ellipsoidal (canoe shape) object which exhibits rotational preference. More precisely, when spun in one direction, after a few seconds it starts pitching (“rattles”), stops spinning, and then slowly begins spinning in the opposite direction.