Question 1

What is the Physiworld Challenge Hub?

Accepted Answer

The Challenge Hub is a growing collection of physics challenges gathered in one place. You can filter or sort the problem set by topic, difficulty or XP, pick any problem, and earn XP for every one you solve. It spans ten topics including dynamics, gravity, fluids, waves, thermodynamics, electromagnetism, optics, nuclear physics and astrophysics.

Question 2

Is the Challenge Hub free to use?

Accepted Answer

Yes. The Challenge Hub is free to play and new challenges are added regularly. Creating a Physiworld account is free too, and lets you track your rank on the leaderboard and earn rewards. Some advanced learning features are available as an optional Physi+ upgrade.

Question 3

Which exams do the challenges cover?

Accepted Answer

The challenges are aligned to Cambridge IGCSE and GCSE Physics (0625), AP Physics 1 and NGSS, so they work for revision across all four. You can filter by topic and difficulty to focus on exactly what you need.

Question 4

How do I earn XP and climb the leaderboard?

Accepted Answer

Every challenge you solve awards XP, which counts toward the weekly and all-time leaderboards. Climbing the leaderboard unlocks rare titles, animated profile frames and trophies reserved for top solvers.

#	Challenge	Topic	Difficulty	XP	Status
01	Free Fall from a Cliff	Dynamics	Easy	10	Solve
02	Weight on the Moon	Gravity	Easy	10	View
03	Does the Crown Float?	Fluids	Easy	10	View
04	Wavelength of a Sound Wave	Vibrations & Waves	Easy	10	View
05	Heating a Kettle	Thermodynamics	Easy	10	View
06	Current Through a Resistor	Electromagnetism	Easy	10	View
07	Image in a Converging Lens	Optics	Medium	15	View
08	Half-Life of a Sample	Nuclear Physics	Easy	10	View
09	Red Shift of a Galaxy	Astrophysics	Medium	15	View
10	Convert the Rocket's Speed	Measurements	Easy	10	View
11	Net Force on a Sled	Dynamics	Easy	10	Solve
12	Orbital Speed of a Satellite	Gravity	Medium	15	View
13	Pressure at Depth	Fluids	Medium	15	View
14	Doppler Shift of a Siren	Vibrations & Waves	Medium	15	View
15	Mixing Hot and Cold Water	Thermodynamics	Hard	20	View
16	Series vs Parallel Bulbs	Electromagnetism	Medium	15	View
17	Angle of Reflection	Optics	Easy	10	View
18	Balancing a Decay Equation	Nuclear Physics	Hard	20	View
19	Light-Years to Proxima Centauri	Astrophysics	Easy	10	View
20	Spot the Dimension Error	Measurements	Medium	15	View
21	Projectile off a Table	Dynamics	Medium	15	Solve
22	Escape Velocity of Mars	Gravity	Hard	20	View
23	Hydraulic Lift Force	Fluids	Medium	15	View
24	Standing Wave on a Guitar String	Vibrations & Waves	Medium	15	View
25	Ice Cube in a Warm Drink	Thermodynamics	Medium	15	View
26	Power Rating of a Heater	Electromagnetism	Medium	15	View
27	Critical Angle in Glass	Optics	Hard	20	View
28	Activity After Three Half-Lives	Nuclear Physics	Medium	15	View
29	Life Cycle of a Massive Star	Astrophysics	Hard	20	View
30	Friction on an Incline	Dynamics	Medium	15	Solve
31	g on a Mystery Planet	Gravity	Easy	10	View
32	Iceberg Below the Waterline	Fluids	Hard	20	View
33	Beat Frequency of Two Tuning Forks	Vibrations & Waves	Hard	20	View
34	Specific Heat of the Pan	Thermodynamics	Easy	10	View
35	Transformer Turns Ratio	Electromagnetism	Hard	20	View
36	Two-Block Tension System	Dynamics	Hard	20	Solve
37	Geostationary Orbit Height	Gravity	Hard	20	View
38	The 25-Joule Launch	Dynamics	Hard	20	Solve
39	Braking Distance at 20 m/s	Dynamics	Easy	10	Solve
40	Momentum of a Skateboard Push	Dynamics	Medium	15	Solve

Physiworld’s
Challenges

You're seeing about 10% of Physiworld.

Physiworld’sChallenges

You're seeing about 10% of Physiworld.

Physiworld’s
Challenges