AP Physics 2

What this covers

• Kinetic theory and thermodynamics: relating microscopic particle speeds to pressure and temperature, PV diagrams, and tracking Q, W, and ΔU through isothermal, adiabatic, isobaric and isochoric processes
• Electrostatics: Coulomb's law with multiple charges, superposing field vectors, sketching field lines and equipotentials, and moving between electric field, potential, potential energy and work
• Circuits with capacitors: series and parallel reduction, Kirchhoff's rules, charging and steady-state behaviour, and what happens to charge, voltage and capacitance when a dielectric or plate separation changes
• Magnetism and induction: force on moving charges and current-carrying wires, right-hand rules, flux through a changing loop, and using Lenz's law to get the direction of an induced current
• Geometric optics: ray diagrams and the thin lens and mirror equation with sign conventions, plus refraction, total internal reflection and image characterisation
• Physical and modern physics: double-slit and thin-film interference, the photoelectric effect, photon energy and momentum, energy level diagrams, and mass–energy in nuclear decay
• Exam-format reasoning: paragraph-length responses, experimental design questions, and translating between a graph, an equation and a verbal explanation

Where learners get stuck

Treating electric potential and electric field as the same idea, or assuming that where E is zero V must also be zero

Both are called 'electric something', both come from the same charge distribution, and textbook problems often ask for them in the same sentence. But one is a vector describing force per charge and the other is a scalar describing energy per charge — at the midpoint between two equal positive charges the field cancels while the potential is at a maximum.

Applying Lenz's law by looking at the direction of the magnetic field instead of the change in flux

Students learn the right-hand rules first and reach for them reflexively. Induced current depends on whether flux is increasing or decreasing, so a loop moving through a uniform field region can have current one way entering, none inside, and the opposite way leaving — even though B never changes direction.

Saying heat and temperature are interchangeable, or that an adiabatic compression cannot raise temperature because no heat was added

Everyday language uses 'heat' as a property of an object rather than as energy in transit. The first law makes the distinction explicit: work done on a gas raises internal energy with Q = 0, and this trips up nearly every PV-diagram question until the sign conventions are practised deliberately.

What a session looks like

A typical session starts with a short diagnostic question spoken aloud — for example, what happens to the charge on a capacitor when a battery stays connected and the plates are pulled apart. From your answer the tutor picks up where the reasoning breaks, then works through one or two problems with you talking through each step: identifying the physical principle before writing anything, checking whether a quantity is a vector or scalar, and sanity-checking the sign or direction of the answer. Sessions usually finish with a spoken paragraph-length justification, since that is the response type most students lose marks on. Diagrams and ray sketches can be described verbally or worked from a problem you're already looking at.

Helpful to know first

• Algebra II, including manipulating equations with several variables, ratios and proportional reasoning, and basic trigonometry (sin, cos, tan and right triangles)
• A first physics course covering forces, energy, momentum and waves — AP Physics 1 or an equivalent honours physics class
• Comfort reading graphs and identifying what a slope or an area under a curve represents physically
• No calculus is required; this course is algebra-based, unlike AP Physics C

Questions

What is the difference between AP Physics 2 and AP Physics C: E&M?

Both cover electricity and magnetism, but Physics C uses calculus — integrals for fields from continuous charge distributions, differential equations for RC circuits — and goes deeper on fewer topics. Physics 2 uses algebra and covers a much wider range, adding thermodynamics, optics and modern physics. Physics 2 also weights conceptual explanation and experimental design more heavily.

Can my child take AP Physics 2 without having taken AP Physics 1?

Some schools allow it if the student has had a solid first-year physics course. The mechanics content itself rarely reappears, but the habits Physics 1 builds — energy conservation reasoning, free-body diagrams, interpreting graphs — carry directly into circuits and thermodynamics. A student coming in cold usually needs extra work on those reasoning patterns rather than on new content.

Which units do students find hardest?

Electric potential and capacitors, and induction, cause the most trouble. Both require holding several related quantities in mind at once and reasoning about change rather than about a single static value. Modern physics is conceptually strange but the calculations are short, so it is often a scoring opportunity late in the year.

How does voice tutoring work for a subject with so many diagrams?

You keep your problem set, textbook or a blank sheet in front of you and describe what you're drawing while the tutor talks you through it — for instance, stating where each ray goes in a converging-lens diagram, or which way the induced current flows around a loop. Being made to verbalise a field-line sketch or a PV cycle exposes gaps that silently copying a diagram does not.