⚡ Physics

Understand it.
Not just survive it.

Videos and problem sets for every unit. Plus the question types nobody warned you were going to be on the test.

Jump to units → Test prep section

Course map

Click a unit to see its videos.

Unit 1 — Introduction to Physics

1.1
Units and Conversions
Dimensional analysis and unit conversion across numbers, tables, and graphs. Simple calculator only — so the method has to be automatic.
Videos + PDFs
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▶ Now Playing
Unit 1.1
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Units and Conversions — Part 1
Unit 1.1 · Part 1
1.2
Scientific Notation
Converting to and from scientific notation across data sets and graphs. Simple calculator only.
Videos + PDFs
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Videos coming soon for this unit.

Unit 2 — Forces and Motion

2.1
Newton's Laws
The three laws from first principles. What each one actually means, when to use it, and how to set up any force problem from scratch.
Videos + PDFs
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Videos coming soon for this unit.
2.2
Kinematics and Motion Graphs
FBDs, motion graphs, and kinematic equations. All four problem types in one standard — and all four come back on every test. The one you do not want to be unprepared for.
Videos + PDFsTest Favorite
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Videos coming soon for this unit.
2.3
Newton's Laws and Forces
All three laws plus free body diagrams in different situations. Know which law applies, how to set up net force, and what each arrow on the FBD actually means.
Videos + PDFs
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Videos coming soon for this unit.

Unit 3 — Torque and Center of Mass

3.1
Definitions and Calculations
Torque, center of mass, rotational equilibrium, levers, mechanical advantage, and trusses. Qualitative and quantitative problems both appear.
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Videos coming soon for this unit.
3.2
Balsa Wood Bridge Project
Engineer a truss bridge that minimizes forces on its members. The truss analysis carries directly into written exams — not just the build itself.
Test Favorite
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Videos coming soon for this unit.

Unit 4 — Work, Energy, and Power

4.1
Energy Definitions and Calculations
Work, power, kinetic and potential energy in a closed system, pulleys, and mechanical advantage. Multiple choice and short free response.
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Videos coming soon for this unit.
4.2
Conservation of Energy
Multi-step closed system problems using energy bar charts. Setting up the right equation for an unfamiliar situation — and knowing what each bar actually represents.
Videos + PDFs
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Videos coming soon for this unit.

Unit 5 — Momentum and Impulse

5.1
Momentum and Impulse
Elastic and inelastic collisions in 1D and 2D. Impulse-momentum theorem, conservation of momentum, force vs time graphs, and velocity vs time graphs.
Videos + PDFsTest Favorite
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Videos coming soon for this unit.

Unit 6 — Fields, Coulomb's Law, Gravitation, and Centripetal Force

6.1
Forces and Circular Motion
Coulomb's law, Newton's law of gravitation, and circular motion of objects and charges. Solving for force, charge, mass, and separation — two objects and beyond.
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Videos coming soon for this unit.
6.2
Fields
Electric and gravitational field diagrams for multiple objects. Direction, relative magnitude, attractive vs repulsive — and what those lines mean for the force on a charge or mass.
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Videos coming soon for this unit.

Unit 7 — Electricity and Circuits

7.1
Ohm's Law and Circuits
Current, voltage, and resistance in series, parallel, and mixed circuits. Complex multi-branch circuits at the top level. Layer by layer, they become solvable.
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Videos coming soon for this unit.
7.2
Power, Capacitance, and Advanced Components
Electrical power, electric potential and energy, capacitance, diodes, and transistors. The components most students ignore until they see them on the test.
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Videos coming soon for this unit.

Unit 8 — Electromagnetism

8.1
Electromagnetism
Motors, generators, solenoids, right-hand rules, flux, Faraday's law, and Lenz's law. Magnetism and electricity as one connected system.
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Videos coming soon for this unit.

Unit 9 — Waves

9.1
Waves and Sound
Wave speed, sound, Doppler effect, resonance, Hooke's Law, earthquakes, and waves in different mediums. Everything that oscillates.
Videos + PDFs
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Videos coming soon for this unit.
9.2
Light and Color
EM spectrum, wave-particle duality, polarization, interference, refraction, and photoelectric effect. How light actually behaves — and why it breaks the rules you'd expect.
Videos + PDFs
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Videos coming soon for this unit.
⚡ Test Prep

The question types that actually show up.

These problems show up on every test. They are not in most textbooks. I tracked the patterns. Here are the walkthroughs.

Multi-step Projectile
Launching from a height with non-standard angles — the ones that need two phases to solve.
Atwood's Machine Variations
Pulley problems with added friction, inclines, or three-mass systems.
Energy with Friction Path
Conservation of energy when friction is doing work — the part that gets left out of most notes.
Wave Superposition
Constructive and destructive interference drawn and calculated at the same time.

PDF library

Practice problems & formula sheets.

📄
Physics Formula Sheet — All Units
Formula reference
Download ↓
📝
Kinematics Practice Problems (with answers)
Unit 1 · 24 problems
Download ↓
📝
Projectile Motion — Test-Style Problems
Unit 3 · 18 problems · Exam difficulty
Download ↓
📝
Work & Energy — Concept + Problems
Unit 4 · 20 problems
Download ↓
📄
Waves & Sound — Full Notes
Unit 6 · Study guide
Download ↓