Study.com Physics 112 Help — Physics II

Circuits and AC analysis are where Physics II gets hard fast. FMMC covers every chapter.

What Physics 112 Covers

Study.com’s Physics 112 is the second course in the introductory physics sequence, accepted at over 2,000 colleges for lower-division credit. It picks up where Physics 101 ends — moving past mechanics and into thermodynamics, electromagnetism, optics, circuits, and modern physics. Students in engineering, pre-med, nursing, and physical sciences programs who need a second physics course typically take Physics 112.

The course runs 13 content chapters. Each ends with a 15-question chapter test — open-book, up to 3 attempts, highest score counts. Chapter tests account for 100 of the 300 total points. The remaining 200 points come from the 50-question cumulative final exam.

Where Students Get Stuck

Physics 112 is a more compact course than Physics 101 — 13 chapters versus 19 — but the four High-difficulty chapters are clustered together in the middle of the course rather than spread across a longer chapter list. In Physics 101, hard chapters are separated by easier ones that give students recovery room. In Physics 112, Chapters 6 through 10 form a sustained difficulty block with only one Medium chapter (Ch 8) as a break. The thermodynamics and light chapters at the start are manageable. The five-chapter stretch from optics through AC circuits is not.

Chapter 6 (Mirrors and Lenses) is the first wall. The mirror and lens equations (1/f = 1/d_o + 1/d_i) look straightforward but break down under the sign conventions. Whether a distance is positive or negative depends on whether the image is real or virtual, whether the mirror is concave or convex — a set of rules students must apply consistently or the equation produces a wrong answer even when the arithmetic is correct. Ray diagrams add a spatial reasoning component that trips up students who are strong at formula application but weak at visualizing where the image forms.

Chapter 7 (Electrostatics) revisits and deepens the electrostatics introduced in Physics 101. At this level, Gauss’s law requires students to choose appropriate Gaussian surfaces and reason about symmetry — a more abstract demand than Coulomb’s law calculations alone. Students who treated Physics 101’s electrostatics chapter as a formula exercise rather than building genuine understanding of electric fields find that Chapter 7 exposes that gap immediately.

Chapter 9 (Circuits) requires applying Kirchhoff’s current law and voltage law to multi-loop DC networks. The procedure is systematic — write one equation per node, one per loop — but if any single equation is set up incorrectly, the entire system of equations produces wrong values for every unknown. Students who are not methodical about labeling current directions and polarities before writing equations consistently produce unsolvable or incorrect systems. This is where most Physics 112 students use all three chapter test attempts.

Chapter 10 (Capacitors, Inductors, and AC) fails students for a different reason. AC circuit analysis introduces impedance and reactance — complex-valued quantities that extend the algebra of Chapter 9 into a domain with no earlier analog in the course. Students must track both magnitude and phase, and the relationships between them do not follow the intuition built from DC circuits. Students who are shaky on Chapter 9’s equation-writing find Chapter 10 compounds the problem. FMMC’s physics help service covers both chapters specifically.

How FMMC Helps with Physics 112

FMMC supports students through Physics 112 on Study.com as well as equivalent second-semester physics courses through our physics help service. Circuit analysis and electromagnetic theory are covered at depth.

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