Physics
Physics is measuring things and then explaining them. Start with the instruments every practical exam uses, then swing, launch, wire and focus your way through mechanics, electricity and light. Each tool has a guided tour and a quiz that explains every answer.
The tools, in learning order
- 01Vernier Caliper & Screw GaugeSlide the jaws of a Vernier caliper or turn a screw gauge, read the scales and check your reading.
- 02Motion GraphsDrive a car and watch its distance–time, velocity–time and acceleration–time graphs draw themselves live.
- 03Forces & Newton's LawsPull a crate across wood, ice or rubber and watch its free-body diagram, friction and F = ma, live.
- 04Energy Skate ParkDrop a skater into a half-pipe and watch kinetic, potential and thermal energy swap, while the total stays the same.
- 05Momentum & CollisionsCrash carts on an air track, elastic or sticky, and see momentum conserved every time while kinetic energy is not.
- 06Pendulum LabChange the length, mass and planet, time the swings and work out g from your own graph.
- 07Waves & SoundMake waves on a rope, see and hear sound, pluck a 3D guitar and hit a drum: wavelength, frequency and v = fλ.
- 08Projectile MotionLaunch a ball at any angle and speed, hit the target and see why 45° goes furthest.
- 09Circuit BuilderDrag batteries, bulbs, resistors and switches onto a board and watch the current flow.
- 010Lenses & LightMove an object past a lens or mirror and watch the rays form real and virtual images.
- 011Physics FormulasEvery physics equation as a calculator: solve for any value, or fill it from your own experiments.
Physics articles
Ohm's Law Explained: V = IR With Worked Examples
Ohm's law links voltage, current and resistance: V = IR. Learn the formula triangle, the units, three worked examples, the I–V graphs and the mistakes that cost marks.
21 October 2026 · 7 min readThe Best Angle for Maximum Range (It Isn't Always 45°)
Why 45° throws a projectile the farthest, why 30° and 60° land in exactly the same spot, and why shot-putters, golfers and air resistance all pull the angle lower.
20 October 2026 · 6 min readHow to Find g Using a Simple Pendulum (Method + Graph)
Measure the acceleration due to gravity with a string and a weight: the method, the T² against L graph, a worked example and the errors that pull you away from 9.81.
17 October 2026 · 5 min readHow to Read a Vernier Caliper (Without Getting It Wrong)
A step-by-step guide to reading a Vernier caliper to 0.1 mm or 0.02 mm, with worked examples, the least count, zero error and the mistakes that cost marks in exams.
17 October 2026 · 5 min read
