11 study chapters
Measurement & tools →
How much can a measurement really tell you?
Measure before calculating · Make a graph say something · Keep direction in the calculation
YOUR NEXT STEP IN PHYSICS
Find the idea.
Build the reasoning.
Choose a subject for a connected reading route, or search for the exact idea that is holding you up. Explanations are open to read; each subject also has complete free practice.
ELEVEN CONNECTED SUBJECTS
Choose what to understand next
7 study chapters
Motion & forces →
Can you explain the motion before choosing an equation?
Describe the change · Explain the change · Connect constraints
2 study chapters
Energy & momentum →
Which conservation law fits this stage of the motion?
Account for energy · Account for impulse
3 study chapters
Rotation & gravity →
What changes when motion has an axis or an orbit?
Choose the axis · Test the contact · Follow the orbit
7 study chapters
Fluids →
Which pressure, shape or flow model applies here?
Balance forces in matter · Follow a moving fluid · Examine the interface
5 study chapters
Oscillations & waves →
What is oscillating, and what is travelling?
Follow one oscillator · Follow a travelling pattern · Change the observation
6 study chapters
Thermal physics →
Where does the energy go when temperature does not change?
Describe the thermal state · Follow energy through a process · Track transfer and cycles
9 study chapters
Electricity & circuits →
What is fixed: charge, potential, current or the connection?
Connect field to energy · Read the network · Follow time and measurement
7 study chapters
Magnetism & induction →
Is the field turning motion, or is changing flux driving a current?
From force to changing flux · Connect induction and phase · Connect fields and matter
9 study chapters
Optics →
Do you need a ray, a phase difference or an aperture?
Build the image · Compare optical paths · Resolve and select light
7 study chapters
Modern physics →
Which energy scale explains the observation?
Connect photons and atoms · Follow nuclear change · Build electronic decisions
A reading session that leads to solving
- Start with the physical question. Sketch the situation and say what changes before reading the equation.
- Make a prediction. Decide on a direction, a limiting case or an expected size. Keep it beside your calculation.
- Attempt, then compare. Work through a question before revealing help. If you need a hint, name the decision you missed.
- Return with a changed condition. Use the chapter’s return questions to check whether you can select the model again without the example in view.
Your saved problems and reading positions help you return. They are study records, not a claim of mastery.