Blog
Kinematics, AP Physics 1, A-Level, Abitur, Bac, and how to practise in the app.
Doppler Effect Formula: Signs and Worked Sound Examples
Choose signs in the Doppler effect formula for sound, then compare moving-source, moving-listener and combined examples with units, checks and limits.
October 23, 2026
Kirchhoff's Laws Explained: Junction and Loop Rules with Examples
Apply Kirchhoff's junction and loop rules to circuits that will not reduce to series and parallel, with a sign convention that survives a wrong guess.
October 20, 2026
Projectile Motion Equations: Worked Examples from Ground and Cliff
Split a launch into horizontal and vertical motion, use projectile motion equations for flight time, height and range, and see when the range shortcut fails.
October 17, 2026
Thin Lens Equation Examples: Real and Virtual Images
Work through thin lens equation examples for real and virtual images. Learn image distance signs, magnification, units and focal-plane limits step by step.
October 14, 2026
Electromagnetic Induction: Faraday's Law with Worked Examples
Understand electromagnetic induction through changing magnetic flux, Faraday's law and Lenz's law, with worked examples, units and sign mistakes explained.
October 11, 2026
Snell's Law Explained: Refraction with Worked Examples
Understand Snell's law with clear ray diagrams and worked examples. Learn to measure angles from the normal and check which way light bends between materials.
October 8, 2026
Archimedes' Principle: Buoyancy Explained with Examples
Learn how buoyancy depends on displaced fluid. Use worked examples to calculate buoyant force, apparent weight, and how much of a floating object is submerged.
October 5, 2026
Capacitors in Series and Parallel: Charge, Voltage, and C
Solve capacitors in series and parallel by tracking shared charge and voltage. Work through equivalent capacitance, mixed networks, units, and sanity checks.
September 28, 2026
Electric Potential vs Electric Field: Height, Slope, and Charge
Electric potential is energy per charge; electric field is force per charge. Compare voltage, signs, units, and worked examples using the height-and-slope idea.
September 26, 2026
Coulomb's Law Intuitively: Charge, Force, and the Electric Field
Coulomb's law says electric force falls with the square of distance. See why, use the formula in checked examples, and follow the force to the electric field.
September 25, 2026
Series and Parallel Circuits: Understand Current and Voltage
Understand series and parallel circuits by following paths and shared nodes. Work through resistance, current, voltage, and power with clear checked examples.
September 24, 2026
Torque Explained Intuitively: Levers, Angles, and Balance
Understand torque as a turning effect, choose the right lever arm, calculate angled forces, and balance a beam with clear worked examples and unit checks.
September 22, 2026
Simple Harmonic Motion Intuitively: Why Oscillations Repeat
Simple harmonic motion starts with a restoring force. Understand springs, pendulums, period, phase, energy, and the key equations through worked examples.
September 20, 2026
How to Draw Free-Body Diagrams: A Step-by-Step Method That Prevents Errors
Learn how to draw a free-body diagram in five steps: isolate the object, list the real forces, draw each arrow, choose axes, and write the second law per axis.
September 17, 2026
How to Prepare for Abitur Physik: Fields, Waves and Quantum Physics
The Abitur Physik path is 38 skills in six units: fields, oscillations, waves, wave optics and quantum physics, on the mechanics they rest on. g = 9.81 m/s².
September 17, 2026
How to Prepare for the Bac Physique: The Spécialité Physics Path
The Bac physique path is 39 skills in seven units: motion, energy, fluids, RC circuits, waves, heat, quantum and nuclear. Chemistry and the ECE are not on it.
September 17, 2026
Physics Mistakes That Are Really Math Mistakes (and How to Fix Each One)
Sign slips, sine and cosine swapped, a bad rearrangement, the wrong quadratic root: seven physics mistakes that are really math mistakes, and a fix for each.
September 16, 2026
Circular Motion Intuitively: Why Constant Speed Needs Force
Circular motion changes velocity even at constant speed. Understand inward acceleration, centripetal force, period, and common mistakes through worked examples.
September 14, 2026
Understanding Momentum Intuitively (The Second Ledger, and Why Collisions Obey It)
Momentum is mass times velocity, impulse is what changes it, and collisions conserve it even when energy is lost. The picture behind p = mv and every collision.
September 11, 2026
Understanding Work and Energy Intuitively (The Bookkeeping Shortcut)
Work is force times distance, energy is the ledger it fills, and conservation is the ledger balancing. Kinetic, potential, friction, power, when to skip Newton.
September 8, 2026
Understanding Newton's Laws Intuitively (Where Motion Comes From)
Newton's three laws are one idea: net force sets acceleration. Free-body diagrams, normal force, friction, third-law pairs and inclines, no wall of formulas.
September 7, 2026
Getting Started with Physics Zen
Kinematics is completely free. Other topics reserve their last skill for Premium. Learn the practice loop, exam-path previews and how to plan your first week.
September 4, 2026
How to Prepare for A-Level Physics: A Five-Section Study Plan
Practise 60 A-Level Physics skills across mechanics, electricity, waves, heat and modern physics, with a teaching-order plan and the correct gravity convention.
September 4, 2026
How to Prepare for AP Physics 1: A Study Plan for the Current Course
AP Physics 1 is now an eight-unit mechanics course. What the exam tests after the Fall 2024 revision, what it no longer covers, and a practice plan that matches the current paper.
September 4, 2026
How to Study Physics Effectively (The Solving Loop)
Physics is not a wall of formulas. See a situation, choose a model, solve, check, and only then open the theory. A practice loop that actually transfers to the next problem.
September 4, 2026
Understanding Kinematics Intuitively (Motion Without the Cause)
Read motion using position, velocity and acceleration. Work through a velocity-time graph, signed displacement, total distance, free fall and projectile basics.
September 4, 2026