• 9th_typt_01.jpg
  • 9th_typt_02.jpg
  • 9th_typt_03.jpg
  • 9th_typt_04.jpg
  • 9th_typt_05.jpg
  • 9th_typt_06.jpg
  • 9th_typt_07.jpg

第13屆臺灣青年學生物理辯論競賽題目

以下為 2021年 IYPT 題目，其中藍色字體標題為 第13屆 TYPT 選入的題目。

 

1. Invent Yourself (Enclosed Boat)

 

Design a boat that moves only due to the periodicalmechanical movements of its internal parts

and which only interacts with the environment (air, water) through its stiff hull. Optimise the parameters

of your boat for maximum speed.

 

2. Circling Magnets

 

Button magnets with different diameters are attached to each end of a cylindrical battery. When placed

on an aluminium foil the object starts to circle. Investigate how the motion depends on relevant parameters.

 

3. Proximity Sensor

 

A simple passive inductive sensor can detect ferromagnetic objects moving through its magnetic field.

Construct such a passive sensor and investigate its characteristics such as sensing range.

 

4. Wind Speed

 

Let an electric current flow through a coil. When cold air flows over the coil, the coil’s temperature will

decrease.Investigate how the temperature drop depends on the wind speed. What is the accuracy of

this method of measuring the wind speed?

 

5. Synchronised Candles

 

Oscillatory flames can be observed when several candles burn next to each other.

Two such oscillators can couple with each other, resulting in in-phase or anti-phase synchronisation

(depending on the distance between the sets of candles). Explain and investigate this phenomenon.

 

6. Irreversible Cartesian Diver

 

A simple Cartesian diver (e.g. an inverted test tube partially filled with water) is placed in a long

vertical tube filled with water. Increasing the pressure in the tube forces the Cartesian diver to sink.

When it reaches a certain depth, it never returns to the surface even if the pressure is changed

back to its initial value. Investigate this phenomenon and how it depends on relevant parameters.

 

7. Bead Dynamics

 

A circular hoop rotates about a vertical diameter. A small bead is allowed to roll in a groove on the

inside of the hoop. Investigate the relevant parameters affecting the dynamics of the bead.

 

8. Fuses

 

A short length of wire can act as an electrical fuse. Determine how various parameters affect the time

taken for thefuse to 'blow'.

 

9. Light Whiskers

 

When a laser beam enters a soap film at a small angle, a rapidly changing pattern of thin,

branching light tracksmay appear inside the film. Explain and investigate this phenomenon.

 

10. Spin Drift

 

When a ring is set to roll in a parabolic bowl, interesting motion patterns may arise. Investigate this phenomenon.

 

11. Guitar String

 

A periodic force is applied to a steel guitar string using an electromagnet. Investigate the motion

of the guitar string around its resonance frequency.

 

12. Wilberforce Pendulum

 

A Wilberforce pendulum consists of a mass hanging from a vertically oriented helical spring.

The mass can both move up and down on the spring and rotate about its vertical axis.

Investigate the behaviour of such a pendulum and how it depends on relevant parameters.

 

13. Sponge

 

A sponge will soak up water at a rate and in a quantity determined by various parameters.

Investigate how effective a sponge is at drying a wet surface.

 

14. Dynamic Hydrophobicity

 

When a drop of liquid impacts on a horizontally moving surface, the droplet may be reflected or not,

depending on the speed of the surface. Investigate the interaction between a moving surface

and a liquid drop.

 

15.Rebounding Capsule

 

A spherical ball dropped onto a hard surface will never rebound to the release height, even if

it has an initial spin.A capsule-shaped object (i.e. Tic Tac mint) on the other hand may exceed

the initial height.Investigate this phenomenon.

 

16.Ultrasonic Pump

 

A capillary immersed in an ultrasonic bath works like a pump that can lift water to a

considerable height.Explain and investigate this phenomenon.

 

17.Hand Helicopter

 

A simple hand helicopter can be made by attaching rotor blades to one end of a vertical stick.

The helicopter moves upwards when the stick is twisted at a high enough speed and then let go.

Investigate how the relevant parameters affect the lift-off and the maximum height.

 

Authors: Cheong-Eung Ahn, John Balcombe, Samuel Byland, Nikita Chernikov, Bohdan Gliševič, Ilya Martchenko, Oksana Pshenichko, Andrei Schetnikov, Frank Smuts, Yuri Stoilov, Igor Timoshchenko, Felix Wechsler, Alexey Zagorulko, Yangping Zhou Figure: Samuel Byland Problem selection committee: John Balcombe, Samuel Byland, Ilya Martchenko

Resoure: https://www.iypt.org/wp-content/uploads/2020/07/problems2021_signed-1.pdf

第12屆臺灣青年學生物理辯論競賽題目

以下為 2020年 IYPT 題目，其中藍色字體標題為 第12屆 TYPT 選入的題目。

 

1. Invent Yourself

Design an instrument for measuring current using its heating effect. What are the accuracy, precision, and limits of the method?

2. Inconspicuous Bottle

Put a lit candle behind a bottle. If you blow on the bottle from the opposite side, the candle may go out, as if the bottle was not there at all. Explain the phenomenon.

3. Swinging Sound Tube

A Sound Tube is a toy, consisting of a corrugated plastic tube, that you can spin around to produce sounds. Study the characteristics of the sounds produced by such toys, and how they are affected by the relevant parameters.

4. Singing Ferrite

Insert a ferrite rod into a coil fed from a signal generator. At some frequencies, the rod begins to produce a sound. Investigate the phenomenon.

5.Sweet Mirage

Fata Morgana is the name given to a particular form of mirage. A similar effect can be produced by shining a laser through a fluid with a refractive index gradient. Investigate the phenomenon.

6.Saxon Bowl

A bowl with a hole in its base will sink when placed in water. The Saxons used this device for timing purposes. Investigate the parameters that determine the time of sinking.

7.Balls on a String

Put a string through a ball with a hole in it such that the ball can move freely along the string. Attach another ball to one end of the string. When you move the free end periodically, you can observe complex movements of the two balls. Investigate the phenomenon.

8.Soap Membrane Filter

A heavy particle may fall through a horizontal soap film without rupturing it. However, a light particle may not penetrate the film and may remain on its surface. Investigate the properties of such a membrane filter.

9.Magnetic Levitation

Under certain circumstances, the “flea” of a magnetic stirrer can rise up and levitate stably in a viscous fluid during stirring. Investigate the origins of the dynamic stabilization of the “flea” and how it depends on the relevant parameters.

10.Conducting Lines

A line drawn with a pencil on paper can be electrically conducting. Investigate the characteristics of the conducting line.

11.Drifting Speckles

Shine a laser beam onto a dark surface. A granular pattern can be seen inside the spot. When the pattern is observed by a camera or the eye, that is moving slowly, the pattern seems to drift relative to the surface. Explain the phenomenon and investigate how the drift depends on relevant parameters.

12.Polygon Vortex

A stationary cylindrical vessel containing a rotating plate near the bottom surface is partially filled with liquid. Under certain conditions, the shape of the liquid surface becomes polygon-like. Explain this phenomenon and investigate the dependence on the relevant parameters.

13.Friction Oscillator

A massive object is placed onto two identical parallel horizontal cylinders. The two cylinders each rotate with the same angular velocity, but in opposite directions. Investigate how the motion of the object on the cylinders depends on the relevant parameters.

14.Falling Tower

Identical discs are stacked one on top of another to form a freestanding tower. The bottom disc can be removed by applying a sudden horizontal force such that the rest of the tower will drop down onto the surface and the tower remains standing. Investigate the phenomenon and determine the conditions that allow the tower to remain standing.

15.Pepper Pot

If you take a salt or pepper pot and just shake it, the contents will pour out relatively slowly. However, if an object is rubbed along the bottom of the pot, then the rate of pouring can increase dramatically. Explain this phenomenon and investigate how the rate depends on the relevant parameters.

16.Nitinol Engine

Place a nitinol wire loop around two pulleys with their axes located at some distance from each other. If one of the pulleys is immersed into hot water, the wire tends to straighten, causing a rotation of the pulleys. Investigate the properties of such an engine.

17.Playing Card

A standard playing card can travel a very long distance provided that spin is imparted as it is thrown. Investigate the parameters that affect the distance and the trajectory.


Authors: Cheong-Eung Ahn, Alan Allinson, John Balcombe, Samuel Byland, Nikita Chernikov, Nicolas Chevalier, Sandu Golcea, Kent Hogan, Yung-Yuan Hsu, Gerard Jennings, Jakob Lavröd, Heorhi Liasneuski, Zakhar Maizelis, Ilya Martchenko, Florian Ostermaier, Peter Poier, Oksana Pshenichko, Julian Ronacher, Andrey Shchetnikov, Chik Cheng Yao
Problem selection committee: John Balcombe, Samuel Byland, Ilya Martchenko

Resoure: https://iypt.org/index.php/problems/problems-for-the-33rd-iypt-2020/

Menu