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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

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Practice collections

Browse all 435 problems ↓
39 problems

Measurement & tools

Read instruments, resolve vectors and check dimensions.

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36 problems

Motion & forces

Read motion, choose a frame and draw the forces.

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23 problems

Energy & momentum

Choose a system and follow what is conserved.

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34 problems

Rotation & gravity

Connect torque, rolling motion and orbits.

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39 problems

Fluids

Balance pressure, buoyancy and steady flow.

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25 problems

Oscillations & waves

Follow a cycle, compare phases and find patterns.

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56 problems

Thermal physics

Track heat, work and temperature changes.

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55 problems

Electricity & circuits

Build fields and simplify circuit connections.

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42 problems

Magnetism & induction

Work with moving charges and changing flux.

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47 problems

Optics

Trace rays and turn path differences into fringes.

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39 problems

Modern physics

Connect photons, matter waves and atomic energies.

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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

9 problems

Advanced01

Electricity & circuits

Find the emf that makes a branch quiet

At what E₂ is the second branch current zero?

Find a missing quantity
Kirchhoff lawsEMF and internal resistance
Start problem
Intermediate02

Electricity & circuits

Infer a source from a reversed branch current

What is the source emf?

Find a missing quantity
Kirchhoff lawsEMF and internal resistance
Start problem
Intermediate03

Electricity & circuits

Find the hidden open-circuit intercept

What emf is consistent with a constant internal resistance?

Read graphs & measurements
EMF and internal resistanceExperimental graphs
Start problem
Advanced04

Electricity & circuits

Choose a physically available cell arrangement

Which n gives the largest load current?

Compare cases
EMF and internal resistanceElectrical power
Start problem
Intermediate05

Electricity & circuits

Choose efficiency instead of peak power

What load resistance meets this efficiency?

Find a missing quantity
EMF and internal resistanceElectrical power
Start problem
Advanced06

Electricity & circuits

Open terminals can hide an internal current

What is the common terminal voltage?

Connect concepts
EMF and internal resistanceKirchhoff laws
Start problem
Advanced07

Electricity & circuits

Predict a load through an equivalent source

What power is dissipated in the load?

Connect concepts
EMF and internal resistanceKirchhoff laws
Start problem
Advanced08

Electricity & circuits

Use a null ratio to isolate internal resistance

What internal resistance follows from this model?

Read graphs & measurements
EMF and internal resistanceElectrical meters
Start problem
Intermediate09

Electricity & circuits

The load sees less than the emf

Find its terminal voltage.

Connect concepts
EMF and internal resistanceOhm law
Start problem