OPhO Problems and Solutions

2025

Online

Free Bird

Problem Solution

Racing Line

Problem Solution

The Cake is a Lie

Problem Solution

Fiber Optics

Problem Solution

Cosmological GPS

Problem Solution

Water Droplet

Problem Solution

A Balancing Act

Problem Solution

Bottle trick 1

Problem Solution

Bottle trick 2

Problem Solution

Frosty

Problem Solution

Electric Disco

Problem Solution

Bungee Jumping

Problem Solution

Bouncing Down the Slope

Problem Solution

Gravity Cable Car

Problem Solution

Magnetic Monopole

Problem Solution

Variant Roulette, House Edge

Problem Solution

Squid Game

Problem Solution

Radioactive

Problem Solution

Arctic Circle

Problem Solution

Hexagons are the Bestagons

Problem Solution

Spring-loaded capacitor

Problem Solution

Supernucleus

Problem Solution

I-Conic

Problem Solution

Problem 24

Problem Solution

Relativistic Race

Problem Solution

Glass Block

Problem Solution

Sproing

Problem Solution

Five Big Booms

Problem Solution

Hang in there!

Problem Solution

Fly Away

Problem Solution

Unconventional Oscillations

Problem Solution

Star Power

Problem Solution

Party Pooper

Problem Solution

A Cloudy Day

Problem Solution

Airplane, qed

Problem Solution


2024

Online

Jaywalking

Problem Solution

Ambidexterity

Problem Solution

Ball Drop

Problem Solution

Coilfun

Problem Solution

Into Orbit

Problem Solution

Roundabout 1

Problem Solution

Roundabout 2

Problem Solution

Atom Smasher

Problem Solution

Dying Light

Problem Solution

Motorized Pendulum 1

Problem Solution

Motorized Pendulum 2

Problem Solution

Motorized Pendulum 3

Problem Solution

Gravitational Oscillations 1

Problem Solution

Gravitational Oscillations 2

Problem Solution

Gravitational Oscillations 3

Problem Solution

Liquid Lenses

Problem Solution

Electric Slide

Problem Solution

Ping-pong 1

Problem Solution

Ping-pong 2

Problem Solution

An Envelope of Light

Problem Solution

Under The Lamplight

Problem Solution

Cannonball

Problem Solution

Filament 1

Problem Solution

Filament 2

Problem Solution

A Question of Counting

Problem Solution

Peculiar Pump

Problem Solution

Air Cushion

Problem Solution

Soapy oscillator

Problem Solution

Relativistic Scattering

Problem Solution

Reluctant Roller

Problem Solution

Solenoid Spring

Problem Solution

Devil’s Trill

Problem Solution

Conducting sheets

Problem Solution

A Tired Flappy Bird

Problem Solution


2023

Online

Coin Flip 1

Problem Solution

Coin Flip 2

Problem Solution

Highway

Problem Solution

Spinning Around

Problem Solution

Born To Try

Problem Solution

Lightbulb

Problem Solution

Hyperdrive

Problem Solution

Asteroid

Problem Solution

Spaceship

Problem Solution

Drag 1

Problem Solution

Drag 2

Problem Solution

Hysteresis 1

Problem Solution

Hysteresis 2

Problem Solution

Marbles

Problem Solution

Fringe effect approximation

Problem Solution

Sliding Along

Problem Solution

Space Elevator 1

Problem Solution

Space Elevator 2

Problem Solution

Laser Power

Problem Solution

Twinkle Twinkle

Problem Solution

My Heart Will Go On

Problem Solution

Tricycle

Problem Solution

Sonic Fryer

Problem Solution

Isotope Separator 1

Problem Solution

Isotope Separator 2

Problem Solution

Somos El Barco

Problem Solution

The Final Countdown

Problem Solution

Magnetic Carts

Problem Solution

De-Terraforming

Problem Solution

All Around The World

Problem Solution

Electrostatic Pendulum 1

Problem Solution

Electrostatic Pendulum 2

Problem Solution

Man In The Mirror 1

Problem Solution

Man In The Mirror 2

Problem Solution

Funiculì, Funiculà

Problem Solution


2022

Online

Two Projectiles

Problem Solution

Bow and Arrow

Problem Solution

City Lights

Problem Solution

Springing Earth

Problem Solution

Battle Ropes

Problem Solution

Polarizers

Problem Solution

Fatal Frame

Problem Solution

The Wire

Problem Solution

Melting Iceberg

Problem Solution

Levitating

Problem Solution

Singing in the Rain

Problem Solution

Rocket Launch

Problem Solution

LC-Diode 1

Problem Solution

LC-Diode 2

Problem Solution

Raging Loop

Problem Solution

Moon Landing

Problem Solution

Tesseract Oscillations

Problem Solution

The Room

Problem Solution

Two Rings

Problem Solution

Pendulum Circuit

Problem Solution

Broken Table

Problem Solution

Resistance box

Problem Solution

Dipole Conductor

Problem Solution

Dying Light

Problem Solution

Tungsten

Problem Solution

Bioshock Infinite

Problem Solution

Magnetic Ball

Problem Solution

Magical Balloon 1

Problem Solution

Magical Balloon 2

Problem Solution

Hydrogen Magnetism

Problem Solution

Relativistic Collision

Problem Solution

Microscope

Problem Solution

Resistor grid

Problem Solution

Strange Gas

Problem Solution


2021

Online

Fastest Path

Problem Solution

Resistor Puzzle

Problem Solution

Derby Race

Problem Solution

Coaxial Cable

Problem Solution

Magnetic Block

Problem Solution

Thermal Train

Problem Solution

Fountain

Problem Solution

Escaping Nieons

Problem Solution

Pico-Pico 1

Problem Solution

Pico-Pico 2

Problem Solution

Golden Apple

Problem Solution

Free Throw

Problem Solution

Right Triangle Potentials

Problem Solution

Toilet Paper Roll

Problem Solution

Maximum Voltage

Problem Solution

Suspended Rod - 1

Problem Solution

Suspended Rod - 2

Problem Solution

One Ladder

Problem Solution

Two Ladders

Problem Solution

Colliding Conducting Slab

Problem Solution

Evil Gamma Photon

Problem Solution

Spinning Cylinder

Problem Solution

Optimal Launch

Problem Solution

Drag on the Plate

Problem Solution

Superconducting Loop

Problem Solution

Cantor Interference

Problem Solution

Solid Core - 1

Problem Solution

Solid Core - 2

Problem Solution

Solenoids

Problem Solution

Accelerating Rockets - 1

Problem Solution

Accelerating Rockets - 2

Problem Solution

Ping Pong - 1

Problem Solution

Ping Pong - 2

Problem Solution


2020

Online

Angry Birds

Problem Solution

The Wheels on the Monster Truck go Round and Round

Problem Solution

Don’t make me reach my Tipping Point

Problem Solution

District 12

Problem Solution

Neutrino Party

Problem Solution

Quarantine Secrets

Problem Solution

Planetary Proton

Problem Solution

Angel Coaster

Problem Solution

Wannabe Twoset

Problem Solution

Waterhorse or Flyinghorse

Problem Solution

Charlie And The Chocolate Factory

Problem Solution

Loopy Wire

Problem Solution

Journey 2: The Magnetic Island 1

Problem Solution

Journey 2: The Magnetic Island 2

Problem Solution

Tuning Outside

Problem Solution

Too Much Potential

Problem Solution

Particle in the Box

Problem Solution

Room of Mirrors 1

Problem Solution

Room of Mirrors 2

Problem Solution

Secret Society

Problem Solution

Focus On That Not This! 1

Problem Solution

Focus On That Not This! 2

Problem Solution

Focus On That Not This! 3

Problem Solution

Two Star Crossed Lovers...

Problem Solution

Too Bored

Problem Solution

You are my Sunshine 1

Problem Solution

You are my Sunshine 2

Problem Solution

Be Reflected It Must

Problem Solution

Braking Up

Problem Solution

With Great Power

Problem Solution

I’m a little teacup

Problem Solution

Tetrahedron Resistance

Problem Solution

Global Warming

Problem Solution

Power Dissipation

Problem Solution

Flattening the Curve

Problem Solution

Hiking in Mountains

Problem Solution

Me and my Crush

Problem Solution

Can’t or can

Problem Solution

Mom Trust the Physics!

Problem Solution

Fbi Open Up!

Problem Solution

Pappu’s Half Disk

Problem Solution

Don’t Fall

Problem Solution

Heartbreak

Problem Solution

Hot or Not

Problem Solution

Sandwiched!

Problem Solution

Tom and Jerry 1

Problem Solution

Tom and Jerry 2

Problem Solution

Tom and Jerry 3

Problem Solution

Ghoster Coaster

Problem Solution

Galactic Games

Problem Solution

Cramped Up

Problem Solution

I knew I should’ve stayed home today

Problem Solution

Fun with a String

Problem Solution

When Rocket Scientists Play Catch

Problem Solution