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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.

Open collection
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

10 problems

Intermediate01

Electricity & circuits

An apparently balanced divider is loaded

What does the voltmeter read?

Connect concepts
Kirchhoff lawsElectrical meters
Start problem
Intermediate02

Electricity & circuits

Which source receives the energy?

At what rate does the 8 V source absorb energy?

Connect concepts
Kirchhoff lawsElectrical power
Start problem
Advanced03

Electricity & circuits

Find what the supply sees through a bridge

What is the equivalent resistance seen by the source?

Find a missing quantity
Kirchhoff lawsWheatstone bridge
Start problem
Advanced04

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
Intermediate05

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
Advanced06

Electricity & circuits

Check mesh algebra with source power

What is the total resistor heating power?

Connect concepts
Kirchhoff lawsElectrical power
Start problem
Advanced07

Electricity & circuits

Open terminals can hide an internal current

What is the common terminal voltage?

Connect concepts
EMF and internal resistanceKirchhoff laws
Start problem
Advanced08

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
Intermediate09

Modern physics

Where does the spare current go?

Find the Zener current.

Connect concepts
Zener voltage regulationKirchhoff laws
Start problem
Intermediate10

Modern physics

Leave enough current for regulation

Find the maximum load current that preserves regulation.

Find a missing quantity
Zener voltage regulationKirchhoff laws
Start problem