IPhO-1984-Pr2 - open-ended problem on oscillations dealing with an interesting natural phenomenon (seiches).

IPhO-1985-Pr3 - a problem on Kepler's laws with a real practical significance.

IPhO-1988-Pr2 - the physics of Maxwell's disc (note that the figure illustrating question 4 is disorienting and the respective official solution is wrong; assuming a long rope, a correct solution is reasonably simple).

IPhO-1989-Pr2 - a short problem on planetary dynamics requiring mathematical insight.

IPhO-1990-Pr3 - an excellent short problem on rotational dynamics requiring insight.

IPhO-1991-Pr1 - this will teach you the basics of the collision of bodies.

IPhO-1992-Pr2 - coupled oscillators in a physically meaningful context.

IPhO-1997-Pr1-Q5 - a problem on scaling laws; note: this problem was also on the Physics Olympiad of Soviet Union-1978.

IPhO-1998-Pr1 - a neat analysis of a rolling pencil.

IPhO-2000-Pr1-Q1 - straightforward physically, but teaching useful technical skills (tailoring solutions).

IPhO-2012-Pr1-Part-A - will test your physical and mathematical insight (about ballistic motion).

IPhO-2014-Pr1-Part-A - problem on a non-standard conservation law of a momentum-like quantity.

APhO-2010-Pr1-Part-A - you'll learn about inelastic scattering on composite particles (the linked text is heavily modified to make it clearer).

APhO-2010-Pr1-Part-B - shows how to make use of a superposition of linear waves.

APhO-2011-Pr2 - a nice model of a real-life problem (creaking door).

APhO-2011-Pr3 - a (relatively) simple model of phase transition (for a birday balloon); tests your physical insight.

APhO-2016-Pr1 - conceptually not a really difficult problem, but you can polish your technical skills (using vector algebra you can find shorter-than-official solutions).

APhO-2017-Pr2 - a nice problem on celestial dynamics - conceptually not too challenging.

Physics Cup 2012 - Pr4 - will test your physical and mathematical insight, including vector analysis (dynamics).

Est-Fin-2005-Pr3 - tests your understanding of Kepler's laws in several ways.

Est-Fin-2005-Pr4 - something for polishing your skills in hydrodynamics (centrifugal pump).

Est-Fin-2006-Pr5 - tests your insight when dealing with pressure forces (air-filled bag).

Est-Fin-2006-Pr6 - geometrical approach to static equilibrium problems.

Est-Fin-2007-Pr2 - linear stability analysis for a slightly tricky geometry (stressed elastic rod).

Est-Fin-2009-Pr7 - develops model building and qualitative estimation skills (breaking soap film).

Est-Fin-2011-Pr6 - very similar to the APhO-2011 Pr2 (violin vs creaking door).

Est-Fin-2012-Pr1 - a many-part problem testing your understanding of planetary dynamics, skills in kinematics, and separation of long and short time-scales.

Est-Fin-2014-Pr6 - tests your physical insight (kinematics).

Est-Fin-2015-Pr4 - a problem on optimal Keplerian trajectories.

Est-Fin-2016-Pr1 - about fuel consumption and interpreting graphs

NBPhO-2017-Pr2 - yet another problem on Kepler laws.

GPhO-2017-Pr2 - a fairly tricky problem with a water-filled tube.

IPhO-1987-Pr3 - this simple model of waveguides tests your skills of dealing with AC and building electro-mechanical equivalence.

IPhO-1993-Pr1 - a problem testing your insight in electrostatics and making use of the characteristic time scales (RC).

IPhO-1994-Pr2 - a nice problem dealing with currents in superconducting circuits.

IPhO-1996-Pr1-Q5 - teaches useful tricks with superposition principle (Ampere's law).

IPhO-1996-Pr2 - teaches how to deal with unusual conservation laws (generalized angular momentum).

IPhO-2000-Pr2 - an excellent problem on the motion of charged particles in E and B fields.

IPhO-2002-Pr2 - teaches dealing with current densities, vector analysis and superposition principle; you can also try to prove the validity of the suggested equivalent circuit (using the method electrical imaging, i.e. constructing the current distribution as a superposition of known valid solutions of the Maxwell equations).

IPhO-2004-Pr1 - tests your understanding of electrostatics (ping-ponging disc inside a capacitor).

IPhO-2011-Pr3 - scattering of an ion by an atom (tests your capability of selecting physically appropriate solutions and interpretation of the lack of solutions).

IPhO-2012-Pr1-Part-C - dealing with magnetic fields in the presence of superconductors (Q3 is really tricky).

IPhO-2012-Pr2 - tests your understanding of electrostatics (Kelvin water dropper).

IPhO-2014-Pr1-Part-C Somewhat artificial and mathematical, but still a useful exercise on a LC-circuit with two degrees of freedom.

IPhO-2016-Pr2 A very nice problem on nonlinear voltage oscillations.

APhO-2009-Pr2 - a problem on magnetic dynamo and linear instability.

APhO-2011-Pr1 - a nice problem testing your insight in electrodynamics (Shockley-James Paradox).

APhO-2013-Pr1 - electrical imaging in cylindrical geometry (approach to the calculation of the RC-time is unnecessarily long).

APhO-2017-Pr1 - a very nice problem; once you study it, you'll understand why it is here under electromagentism.

Physics Cup 2012 - Pr5 - calculation of natural frequencies while making use of the separation of time scales.

Physics Cup 2012 - Pr6 - a nice problem covering electrical imaging, electrostatic pressure, and electrostatic energy.

Physics Cup WoPhO-2013 - Pr5(10) - dealing with magnetic fields in the presence of superconductors.

Physics Cup 2017 - Pr1 - a really tough problem on electrostatics...

Physics Cup 2017 - Pr2 - ... and on electric circuits.

Est-Fin-2007-Pr3 - teaches about time focusing (phenomenon similar to wave breaking); a problem rooting from the IPhO-2001-Pr1-Q1.

Est-Fin-2010-Pr1 - somewhat artificial, but still a useful exercise (on using optimal reference frames).

Est-Fin-2012-Pr7 - a non-trivial problem on Ampere's force.

Est-Fin-2014-Pr1 - tests your understanding of circuits containing L and C in various ways.

Est-Fin-2015-Pr9 - a useful exercise on coupled solenoids and mutual inductance.

Est-Fin-2016-Pr4 - have you ever wondered how dimmer works?

NBPhO-2017-Pr7 - quite a tricky problem with zener diode in AC circuit.

GPhO-2016-Pr3 - teaches about strong magnetic fields (incl magnetars).

GPhO-2017-Pr3 - a fairly challenging problem about acceleration of charged particles with shock waves.

IPhO-1992-Pr2 - a solid problem on heat radiation with real-life implications (satellite in sunlight).

IPhO-1996-Pr1-Part-d - a small but useful exercise (triple-wall-thermos).

IPhO-1998-Pr2 - a problem dealing with the basics of mechanics and thermodynamics (ice flow and melting).

IPhO-2008-Pr3 - with a mathematical emphasis and with a prescribed approach, but teaching important atmospheric physics (adiabatic atmosphere).

IPhO-2010-Pr2 - a nice problem on chimney physics.

IPhO-2012-Pr1-Part-B - tests your insight into the physics of gas flows (turned out to be surprisingly difficult, with only one full solution among the contestants).

IPhO-2012-Pr3-Q4&6 - tests your understanding of the I law of thermodynamics and adiabatic processes (those familiar with standard protostar evolution models need to read the text carefully: the model is slightly modified).

IPhO-2014-Pr1-Part-B Somewhat artificial and non-realistic setup, but still a valid exercise on a polytropic process.

APhO-2010-Pr3-PartB - somewhat mathematical, but with a nice physics (sonoluminescence).

APhO-2014-Pr1 - an excellent problem on atmospheric circulation.

Physics Cup WoPhO-2013 - Pr4(9) - a challenging problem on the laws of thermodynamics.

Physics Cup 2017 - Pr3 - with this problem, you can get some insight into adiabatic processes.

Est-Fin-2005-Pr7 - physics of the ventilation system of your zero-energy house.

Est-Fin-2006-Pr1 - on the humidity and mixing of cold and hot air.

Est-Fin-2008-Pr7 - a simplified version of the Pr3 from IPhO-2008 (rising smoke).

Est-Fin-2010-Pr2 - somewhat similar to IPhO-1996-Pr1-Part-d, but with a trickier geometry (thermos bottle).

Est-Fin-2011-Pr8 - a tricky problem on heat conduction.

Est-Fin-2013-Pr7 - an ordinary problem on heat radiation, but with a useful conclusion (a limit to the F-number of a lens).

IPhO-1993-Pr3 - teaches several important concepts and techniques (electrostatic biprism).

IPhO-2003-Pr3-PartB - there are other similar problems, as well (e.g. IPhO-1993-Pr2), but this should be enough to get the idea (of radiation pressure).

IPhO-2005-Pr3 - while the whole problem is worth solving, the highlight is the last task (one can guess the right answer quite easily, but doing it properly requires a thorough understanding of the basic quantum mechanics - stationary states and line widths).

IPhO-2006-Pr1 - a Mach–Zehnder interferometer for neutrons.

APhO-2016-Pr3 - magnetic fields + quantum physics - about superconductors (there is an easier solution to Part D2 than the official ones).

Physics Cup WoPhO-2013 - Pr3(8) - a beautiful problem in various ways (bubbles in laser light).

Est-Fin-2004-Pr4 - tests your understanding of the interference on thin films.

Est-Fin-2005-Pr5 - on 2-dimensional interference patterns.

Est-Fin-2015-Pr2 - physics of short light pulses.

IPhO-1994-Pr1 - a nice problem on ultrarelativistic particles.

IPhO-1995-Pr1-PartC - a small exercise on relativistic dynamics (although parts A and B are useful, too, these can be skipped).

IPhO-1995-Pr2 - a somewhat mathematical problem on geometrical optics (for sound), with an interesting physics.

IPhO-1998-Pr3 - a simple relativistic analysis of a nice astrophysical effect.

IPhO-2003-Pr3-PartA - a challenging problem on relativistic dynamics requiring either a lot of experience, or a flash of inspiration.

IPhO-2016-Pr3 A good exercise on relativistic dynamics; with part A6 you will learn, once again, that in relativity, you should use momentum instead of speed.

APhO-2007-Pr3-PartB - an exercise for mastering relativistic dynamics (inverse Compton scattering).

APhO-2014-Pr3 - on gravitational lenses.

Physics Cup 2012 - Pr9 - on relativistic inelastic scattering - turned out to be the simplest problem of Physics Cup.

Physics Cup 2017 - Pr4 - another challenging problem on geometrical optics constructions.

Est-Fin-2012-Pr6 - a problem abut uranium decay and heat balance.

Est-Fin-2013-Pr9 - another problem for testing your skills in geometrical optics.

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