一、Invent Yourself
Construct a simple seismograph that amplifies a local disturbance by mechanical, optical or electrical methods. Determine the typical response curve of your device and investigate the parameters of the damping constant. What is the maximum amplification that you can achieve?
一、自主发明 建造一个可以通过力学、光学或电学方式放大局部扰动的简单地震仪。肯定你装 置的标准响应曲线而且研究阻尼常数的参量。你能达到的最大放大率是多少？
2. Colour of Powders
If a coloured material is ground to a powder, in some cases the resulting powder may have a different colour to that of the original material. Investigate how the degree of grinding affects the apparent colour of the powder.
二、粉末的颜 若是一个有的材料被研磨成粉末，在某些情况下被研磨成的粉末将会呈现和原 有材料不同的颜。探讨研磨程度是如何影响粉末的表面颜的。
3. Dancing Coin特斯拉召回 2021
Take a strongly cooled bottle and put a coin on its neck. Over time you will hear a noise and see movements of the coin. Explain this phenomenon and investigate how the relevant parameters affect the dance.
3、舞蹈的硬币 取一个冷却程度很大的瓶子而且将一枚硬币置于瓶颈处。过段时间你将听到声音 而且观察到硬币的移动。解释这一现象而且研究影响此舞蹈的相关参量。
4. Heron's Fountain
Construct a Heron’s fountain and explain how it works. Investigate how the relevant parameters affect the height of the water jet.
4、 Heron 的喷泉
建造一个 Heron 的喷泉并解释它的工作原理。研究相关参量是如何影响水柱高度 的。
5. Drinking Straw
When a drinking straw is placed in a glass of carbonated drink, it can rise up, sometimes toppling over the edge of the glass. Investigate and explain the motion of the straw and determine the conditions under which the straw will topple.

五、吸管 当一根吸管被放置于一杯碳酸饮料里时，吸管会上升，有时会翻出杯子边缘。研 究并解释吸管的运动而且肯定吸管翻出时的条件。
6. Ring Oiler
An oiled horizontal cylindrical shaft rotates around its axis at constant speed. Make a ring from a cardboard disc with the inner diameter roughly twice the diameter of the shaft and put the ring on the shaft. Depending on the tilt of the ring, it can travel along the shaft in either direction. Investigate the phenomenon.
六、环形注油器 一个涂过油的水平#放置的圆柱形杆以恒定的速度绕着它的轴旋转。用硬纸板圆 盘做成一个内径约为杆直径的两倍的圆环并套在杆上。按照环的倾斜程度，它可 以沿
杆向任意两个方向移动。探讨这一现象。
7. Conical Piles
Non-adhesive granular materials can be poured such that they form a cone-like pile. Investigate the parameters that affect the formation of the cone and the angle it makes with
the ground. 7、锥形堆
无黏着力的颗粒状材料倾倒在一路会形成一种圆锥状的堆。研究影响锥形的形成
和锥面与地面夹角的参量。
8. Cusps in a Cylinder
A horizontal cylinder is partially filled with a viscous fluid. When the cylinder is rotated around its axis, unusual fluid behaviour can be observed, such as cusp-like shapes on the walls of the cylinder. Investigate the phenomenon.
八、筒中尖端 一个水平放置的圆筒里部份装有粘性流体。当圆筒绕着它的轴线旋转时，可以观 察到不寻常的流体行为，例如筒壁上会呈现尖状。研究这一现象。
9. Candle in Water
Add some weight to a candle such that it barely floats in water. As the candle burns, it may continue to float. Investigate and explain this phenomenon.
九、水中蜡烛

增加蜡烛重量使其勉强在水中漂浮。随着蜡烛的燃烧，它可能会继续漂浮。研究 并解释这一现象。
10.Tesla Valve
A Tesla valve is a fixed-geometry, passive, one-direction valve. A Tesla valve offers a resistance to flow that is much greater in one direction compared to the other. Create such
a Tesla valve and investigate its relevant parameters.
10、特斯拉阀门 特斯拉阀门是一个有固定几何形状的被动的单向阀门。特斯拉阀门提供对一个方 向相较另一个方向的流动要大得多的流体阻力。创造一个这样的特斯拉阀门并研 究相关参数。
11、Azimuthal-Radial Pendulum
Fix one end of a horizontal elastic rod to a rigid stand. Support the other end of the rod with a taut string to avoid vertical deflection and suspend a bob from it on another
string (see figure). In the resulting pendulum the radial oscillations (parallel to the rod) can spontaneously convert into azimuthal oscillations (perpendicular to the rod) and vice versa. Investigate the phenomenon.
11、轴向径向摆

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