Subjects
Physics
Light, electricity, motion, oscillation and waves: change a value and watch the formula work.
- Refraction of light
- Ohm's law
- Projectile motion
- Simple pendulum
- Electric field
- Wave interference
- Free Fall
- Lens ray diagrams
- Newton's Laws of Motion
- Spherical mirror ray diagrams
- Electromagnetic Induction
- Conservation of Momentum and Collisions
- Work, Energy and Power
- Inclined Plane
Chemistry
Atoms, bonds, acids and bases, reactions: watch the invisible particles move.
- Structure of the atom
- Acids, Bases and the pH Scale
- Electron configuration
- Gas laws: Boyle, Charles, Gay-Lussac, Avogadro and PV = nRT
- How an Ionic Bond Forms
- Electrolysis and Faraday’s Laws
- Covalent Bond
- Periodic Trends
Biology
Cells, division, diffusion and osmosis: the processes of life, step by step.
- Mitosis cell division
- Diffusion and Osmosis
- Photosynthesis
- The human heart: structure and function
- Mendelian Genetics
- DNA Replication
- Cellular Respiration
- Enzyme Action
- The Nerve Impulse and the Action Potential
- The Nephron and Urine Formation
- Meiosis Cell Division
- Digestive System
Mathematics
Geometry, trigonometry and graphs: drag a point and see why the theorem holds.
- Pythagorean Theorem
- Trigonometric Ratios and the Unit Circle
- Quadratic functions and their graphs
- Circle theorems
- Heights and distances: elevation and depression angles
- Probability: experimental vs theoretical probability
- Arithmetic and Geometric Sequences
- Mean, Median and Mode
All animations: Physics
Grade 8–12
Refraction of light
Change the angle and watch light bend. Snell's law, refractive index, critical angle and total internal reflection, explained simply with worked examples.
Grade 9–12
Ohm's law
Adjust voltage and resistance and watch the current change. Ohm's law formula, V-I graph, series and parallel resistors, with solved problems.
Grade 11
Projectile motion
Set the launch angle and speed and trace the path. Time of flight, maximum height and range formulas, why 45° goes farthest, with solved numbers.
Grade 9–11
Simple pendulum
Change length and gravity and time the swing. Simple pendulum period T = 2π√(L/g), SHM, energy conservation and finding g, with solved numbers.
Grade 10–12
Electric field
Drop positive and negative charges and watch the field lines form. Coulomb's law, E = kq/r², units and field-line rules, with solved examples.
Grade 11–12
Wave interference
Move two wave sources and watch bright and dark fringes appear. Superposition, constructive vs destructive conditions, fringe width, solved examples.
Grade 9–11
Free Fall
What is free fall? Drop a coin and a feather with and without air. Learn the free fall formulas for time, velocity and height (g = 9.8 m/s²) with worked examples.
Grade 10–12
Lens ray diagrams
Interactive convex and concave lens ray diagrams: drag the object through all six cases, see the three principal rays, and read u, v, f, magnification and power live.
Grade 9–11
Newton's Laws of Motion
Newton's laws of motion explained with an interactive cart: inertia, F = ma, momentum, impulse and action–reaction pairs, with examples and worked problems.
Grade 10–12
Spherical mirror ray diagrams
Drag an object in front of a concave, convex or plane mirror and watch the rays find the image. Mirror formula, magnification, all six cases, solved problems.
Grade 10–12
Electromagnetic Induction
What is electromagnetic induction? Drag a bar magnet through a coil and watch a centre-zero galvanometer. Learn Faraday's law e = −N dΦ/dt and Lenz's law with worked examples.
Grade 9–11
Conservation of Momentum and Collisions
What is the conservation of momentum? Collide two carts and drag the restitution slider from a sticking e = 0 to a bouncy e = 1. See momentum and kinetic-energy bars update live, with worked examples.
Grade 9–11
Work, Energy and Power
What is work, and what are the formulas for kinetic and potential energy and power? Release a cart on a curved track, watch energy turn to heat, with worked examples.
Grade 9–11
Inclined Plane
How does a block’s weight split on a slope, what is the angle of repose, and when does friction hold a block still or let it slide? Change the angle yourself and watch the force-arrow diagram.
All animations: Chemistry
Grade 8–11
Structure of the atom
Structure of the atom explained with an interactive simulation: protons, neutrons, electrons, atomic and mass number, isotopes and electron configuration, with solved examples.
Grade 8–11
Acids, Bases and the pH Scale
What is pH and what does the pH scale show? Drip a base into an acid, watch the indicator change colour and trace a live titration curve, with worked pH problems.
Grade 9–11
Electron configuration
How to write electron configurations: Aufbau order, Pauli and Hund rules, the Cr and Cu exceptions, ions and noble-gas shorthand. Watch electrons fill, Z 1–36.
Grade 9–11
Gas laws: Boyle, Charles, Gay-Lussac, Avogadro and PV = nRT
Push a piston and heat a gas: Boyle's, Charles's, Gay-Lussac's and Avogadro's laws, the ideal gas law PV = nRT, graphs, R values and solved problems.
Grade 8–11
How an Ionic Bond Forms
What is ionic bonding, and how does a metal atom transfer electrons to a non-metal to form ions? Drop NaCl, MgO or CaCl2 into the simulation and watch charge balance derive the formula, with worked examples.
Grade 9–12
Electrolysis and Faraday’s Laws
What is electrolysis, what forms at the cathode and anode, and how does Faraday's law compute the mass deposited? Choose molten NaCl, CuSO2 or acidified water and watch, with worked examples.
Grade 9–12
Covalent Bond
What is a covalent bond? Build H₂O, NH₃, CH₄ and CO₂ atom by atom in a dot-and-cross simulation: single, double and triple bonds, lone pairs, the octet rule and bond polarity, with worked examples.
Grade 9–11
Periodic Trends
What are periodic trends? See how atomic radius, ionization energy, electronegativity and metallic character change across a period and down a group, on a heat map of the first 36 elements, with the real exceptions.
All animations: Biology
Grade 9–11
Mitosis cell division
Watch mitosis happen: interphase, prophase, metaphase, anaphase, telophase and cytokinesis in an interactive animation, with chromosome counting rules and solved problems.
Grade 8–11
Diffusion and Osmosis
Diffusion vs osmosis explained with a live particle simulation: definitions, the difference table, tonicity, plasmolysis, turgor and imbibition, with solved examples.
Grade 7–11
Photosynthesis
Photosynthesis explained: the equation, light-dependent stage, Calvin cycle and limiting factors. Change light, CO₂ and temperature in a live leaf simulation.
Grade 9–11
The human heart: structure and function
See the four chambers, valves, lub-dub sounds and a live ECG in one animated heart. Learn double circulation, the cardiac cycle and cardiac output.
Grade 10–12
Mendelian Genetics
Learn Mendel's laws with a real Punnett-square builder: monohybrid and dihybrid crosses, test crosses, incomplete dominance, blood-type codominance, and sex determination — every ratio computed live.
Grade 11–12
DNA Replication
DNA replication explained: semi-conservative copying, key enzymes, leading vs lagging strand, Okazaki fragments and the Meselson-Stahl proof — in a live simulation.
Grade 9–11
Cellular Respiration
Cellular respiration explained: aerobic vs anaerobic respiration, glycolysis, the Krebs cycle, the electron transport chain and ATP yield. Run the mitochondrion simulation and see the numbers add up.
Grade 9–11
Enzyme Action
What an enzyme is, the active site, lock-and-key vs induced-fit models, how temperature, pH and inhibitors change its rate, and the Michaelis-Menten equation — explore it live in a simulation.
Grade 10–11
The Nerve Impulse and the Action Potential
See a stimulus above threshold (-55 mV) fire an action potential that races down the axon — continuous or saltatory — and release neurotransmitter at the synapse, with the real formulas.
Grade 9–11
The Nephron and Urine Formation
See how a kidney filters about 180 litres of fluid a day yet passes only around 1.50 litres of urine — filtration, reabsorption and the glucose threshold, with the real formulas.
Grade 9–11
Meiosis Cell Division
What is meiosis, what is crossing over, and how is it different from mitosis? Run a 2n = 4 cell through prophase I to telophase II yourself, with worked examples.
Grade 9–10
Digestive System
What is digestion, which enzyme acts where, and how do villi absorb nutrients? Run food's journey from mouth to large intestine yourself, with worked examples.
All animations: Mathematics
Grade 8–10
Pythagorean Theorem
The Pythagorean theorem explained: formula a² + b² = c², two proofs you can watch, the converse, Pythagorean triples and 10 worked examples. Drag the triangle yourself.
Grade 10–11
Trigonometric Ratios and the Unit Circle
Drag a point round the unit circle and watch sin, cos and tan change. Standard angle table, ASTC signs, identities, radians and graphs, with solved examples.
Grade 9–11
Quadratic functions and their graphs
Drag the vertex and change a, b, c to see how a quadratic function graph moves. Learn factoring, completing the square, the quadratic formula and discriminant.
Grade 9–10
Circle theorems
All the circle theorems with drag-and-check diagrams: angle at the centre, same segment, semicircle, cyclic quadrilateral, chords, tangents and alternate segment.
Grade 9–10
Heights and distances: elevation and depression angles
What angle of elevation and angle of depression mean, how the height-and-distance formula works, and how two observations solve a tower's height without ever measuring it — with an interactive simulation and solved problems.
Grade 9–11
Probability: experimental vs theoretical probability
What probability means, how the sample-space formula P(E) = n(E)/n(S) works, and why experimental frequency edges closer to theoretical probability the more you flip, roll or draw — with a coin, dice and coloured-ball simulator.
Grade 10–11
Arithmetic and Geometric Sequences
Learn the arithmetic and geometric sequence formulas for the nth term and sum, Gauss's pairing trick, and the sum-to-infinity formula a/(1−r), with a drag-and-slide bar-chart simulation and worked examples.
Grade 9–10
Mean, Median and Mode
Learn the mean, median and mode formulas, why the median resists an outlier while the mean does not, and the grouped-data median/mode formulas, by dragging points on a number line, with worked examples.
Keep studying this topic
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