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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

316 problems · Showing 12

Intermediate01

Rotation & gravity

A couple changes the support share

What is the upward reaction at the right support?

Connect concepts
Static equilibriumTorque
Start problem
Intermediate02

Rotation & gravity

Infer the mass distribution from a descent

What value of β follows from the energy measurements?

Find a missing quantity
Rolling energyMoment of inertia
Start problem
Intermediate03

Rotation & gravity

A torque graph can reverse a rotor

What is its angular velocity at t=4 s?

Read graphs & measurements
Angular momentumRotational dynamics
Start problem
Intermediate04

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
IntermediateFree sample05

Magnetism & induction

Apply the charge sign last

The cross product and the sign of the charge are two separate direction decisions.

Apply a principle
Lorentz forceCrossed fields
Start problem
Intermediate06

Magnetism & induction

Read velocity components from a helix

What is the ratio |v_parallel|/v_perpendicular?

Read graphs & measurements
Magnetic force on a chargeCharged-particle circular motion
Start problem
Intermediate07

Magnetism & induction

Zero flux can still mean current

At t=3.0 s, what is the signed current? Counterclockwise viewed from +z is positive.

Apply a principle
Magnetic fluxLenz law
Start problem
Intermediate08

Measurement & tools

A stack carries one zero offset

What is the inferred average sheet thickness?

Apply a principle
Micrometer screw gauge
Start problem
Intermediate09

Measurement & tools

A diameter bound becomes an area bound

What is the approximate percentage bound on area?

Compare cases
Micrometer screw gaugeError propagation
Start problem
IntermediateFree sample10

Electricity & circuits

Half the pointer, a changing source current

The shunt-equals-coil shortcut is a limiting result, not the defining physics of half deflection.

Apply a principle
Galvanometer half-deflection experiment
Start problem
Intermediate11

Rotation & gravity

Two distances describe one ellipse

What is its orbital eccentricity?

Read graphs & measurements
Kepler laws
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Intermediate12

Rotation & gravity

Subtract the surface after finding the orbit

What is its altitude above the surface?

Apply a principle
Geostationary and synchronous orbitsCircular satellites
Start problem

12 of 316 shown