PhysicsRankPREVIEWTry a problem

THE PRACTICE STUDIO

Physics practice.
One idea at a time.

Choose a topic, try a problem, and work through the reasoning. Take a hint when you need one. Keep going when it clicks.

435 problems11 topic collections72 study chapters

CHOOSE YOUR NEXT TOPIC

Practice collections

Browse all 435 problems ↓
39 problems

Measurement & tools

Read instruments, resolve vectors and check dimensions.

Open collection
36 problems

Motion & forces

Read motion, choose a frame and draw the forces.

Open collection
23 problems

Energy & momentum

Choose a system and follow what is conserved.

Open collection
34 problems

Rotation & gravity

Connect torque, rolling motion and orbits.

Open collection
39 problems

Fluids

Balance pressure, buoyancy and steady flow.

Open collection
25 problems

Oscillations & waves

Follow a cycle, compare phases and find patterns.

Open collection
56 problems

Thermal physics

Track heat, work and temperature changes.

Open collection
55 problems

Electricity & circuits

Build fields and simplify circuit connections.

Open collection
42 problems

Magnetism & induction

Work with moving charges and changing flux.

Open collection
47 problems

Optics

Trace rays and turn path differences into fringes.

Open collection
39 problems

Modern physics

Connect photons, matter waves and atomic energies.

Open collection
01

Build the foundations

Start with one principle and a clear model.

02

Connect the ideas

Choose the right method and carry it through.

03

Take on a challenge

Combine constraints, conservation laws and careful reasoning.

PRACTISE AT YOUR PACE

Explore all problems

4 problems

AdvancedFree sample01

Rotation & gravity

One axis for the whole rotor

Inertia can be added only after every contribution refers to the same axis.

Connect concepts
Moment of inertiaParallel-axis theorem
Start problem
Intermediate02

Rotation & gravity

Undo the old axis shift first

What is the new moment of inertia?

Find a missing quantity
Parallel-axis theoremMoment of inertia
Start problem
Intermediate03

Rotation & gravity

An equivalent radius for a rod

Find its radius of gyration about an axis perpendicular to the rod through one end.

Connect concepts
Radius of gyrationParallel-axis theorem
Start problem
Intermediate04

Rotation & gravity

Move the rotation axis

Find its moment of inertia about the new axis.

Apply a principle
Parallel-axis theoremMoment of inertia
Start problem