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Search every subject world, from Preschool to Grade 12. The first five courses of every subject path are free.

32 courses

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Science · Grade 6

Identify a Need and Constraints

Engineering starts with people, not gadgets. Learners observe and listen to users and stakeholders to find a genuine need, plan respectful user research with neutral questions, write solution-neutral problem statements with a sensible scope, and turn a client's wish list into a specification: firm constraints plus measurable criteria with target values, units and test methods. An optional Going further lesson adds factors of safety, shared budgets and breaking a large problem into sub-problems.

  • 5 lessons
  • About 110 min
  • Quiz: 10 questions
Free starter

Science · Grade 6

Research, Sketch and Model

Learners take a defined problem (a tablet stand for a school's video-call corner) from research to a modelled concept. They analyse existing solutions function by function and record sources honestly, generate many ideas before judging, select concepts by screening against constraints and comparing with a reference design, communicate with annotated sketches and orthographic views, convert between drawing and real lengths with scales, and choose physical, digital or mathematical models while stating their limits. An optional Going further lesson explores how areas and masses change when models are scaled, and counts concepts in a morphological chart.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Materials, Structures and Mechanisms

Learners equip a school's outdoor classroom. They choose materials by matching whole property profiles (strength, stiffness, density, toughness, durability, conductivity, cost) to requirements, using density data from a float simulation; explain tension, compression, triangulation, trusses and deep beams; and use levers, pulleys, wheels and axles and gears, calculating ideal mechanical advantage and the force-for-distance tradeoff. An optional Going further lesson calculates work, efficiency and compound gear ratios.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Energy, Controls and Simple Systems

Learners treat devices as systems. They trace energy chains through devices and separate useful outputs from energy that spreads to the surroundings; describe a school greenhouse's cooling system as inputs, processes and outputs with sensors, a controller, actuators and a power source; compare open-loop and closed-loop control and write and trace flowcharts; and use a circuit simulation to choose series or parallel arrangements for a lantern. An optional Going further lesson calculates power, energy budgets, battery run time and efficiency, and adds a switching band (hysteresis) to on/off control.

  • 5 lessons
  • About 115 min
  • Quiz: 10 questions
Free starter

Science · Grade 6

Prototype in Safe Virtual Environments

Learners choose prototypes of the right fidelity for each design question, then use two simulations as virtual prototypes: a ramp model to map a design space and find every setting that lands a toy car in a target zone, and a heat-transfer model to screen handle materials for a camping mug. They list what each simulation leaves out, separate questions a model can answer from those that need a physical test, and plan safe physical prototyping with a hazard–risk–control assessment. An optional Going further lesson calibrates a model against real measurements and contrasts interpolation with extrapolation.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Test, Measure and Iterate

A maker club's recycled-card shelf brackets keep failing, and learners use them to practise the testing half of engineering. They write test plans tied to specific requirements with pass thresholds and repeated trials, choose instruments with suitable resolution, summarise repeated measurements, handle odd results honestly, and use a sampling simulation to see why quality checks need large enough samples. They analyse failures with the 'five whys' to separate symptoms from root causes, then make data-driven iterations, one change at a time, and decide when to stop. An optional Going further lesson quantifies measurement uncertainty and compares designs whose results overlap.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions

Science · Grade 6

Accessibility, Sustainability and Tradeoffs

Good designs work for the full range of people who will use them and do as little harm as possible across their whole life. Learners apply universal-design principles and check accessibility with real users, trace a product's environmental impact through its life cycle, and weigh competing criteria with a weighted decision matrix and a sensitivity check. A Going further lesson compares options quantitatively with functional units, break-even points and payback times.

  • 4 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 6

Document and Demonstrate a Design

The final course turns a design project into evidence other people can trust and build on. Learners keep an honest engineering notebook, structure a design report that traces every requirement to a test and a result, present data clearly and truthfully, credit sources and teammates, and plan an accessible demonstration that invites critique. A Going further lesson adds a bill of materials, safety margins and a verification summary.

  • 5 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 11

Measurement, Uncertainty and Physics Models

Learners build the measurement toolkit that every later physics course relies on: SI units, prefixes and dimensional checks; reporting measurements with absolute and percent uncertainty and matching significant figures; and combining uncertainties in calculations. They then linearise data (T² against L for a pendulum) to extract a physical constant from a gradient, and judge physics models by their assumptions, their domain of validity and whether they agree with data within uncertainty.

  • 5 lessons
  • About 120 min
  • Quiz: 10 questions
Free starter

Science · Grade 11

Motion in One and Two Dimensions

Learners describe motion precisely with vectors, read and draw position–time and velocity–time graphs (gradient and area), and solve problems with the constant-acceleration equations, including free fall. They finish by analysing projectiles as two independent motions, constant velocity horizontally and constant acceleration vertically, linked only by time.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions
Free starter

Science · Grade 11

Forces and Newtonian Models

Learners identify the forces on an object and draw free-body diagrams, then use Newton's first and second laws to predict motion for single objects, connected objects and people in lifts. They model friction with static and kinetic coefficients, resolve weight on inclines, and finish by separating Newton's third-law pairs from balanced forces on one object.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions
Free starter

Science · Grade 11

Momentum and Interactions

Learners treat momentum as a vector, connect impulse to force–time graphs, and derive conservation of momentum from Newton's third law. They apply it to collisions, recoil and explosions, use kinetic energy to tell elastic from inelastic collisions, and finish by using impulse to evaluate and design devices that reduce collision forces, from crumple zones to helmet liners.

  • 5 lessons
  • About 120 min
  • Quiz: 10 questions
Free starter

Science · Grade 11

Work, Energy and Conservation

Learners define work as energy transferred by a force (W = Fd cos θ) and connect it to kinetic energy through the work–energy theorem. They calculate kinetic, gravitational and elastic potential energy, apply conservation of energy with and without friction (including a ramp simulation whose limits are stated), and finish with power and efficiency, tracking where energy goes in real machines.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions
Free starter

Science · Grade 11

Circular Motion and Gravitation

Learners show that an object moving in a circle at constant speed is accelerating toward the centre (a = v²/r) and identify the real forces that supply that centripetal force on roads, strings and loops. They then use Newton's law of universal gravitation and the inverse-square relationship to calculate forces and field strengths, model circular orbits, explain apparent weightlessness, and linearise planetary data to confirm Kepler's third law and even estimate Earth's mass.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions

Science · Grade 11

Waves and Superposition

Learners model waves as travelling disturbances that carry energy, not matter, and describe them quantitatively with amplitude, wavelength, period, frequency and speed. They use v = fλ, apply the principle of superposition to predict constructive and destructive interference from path differences, and analyse standing waves on strings, including harmonics and a simulated string investigation.

  • 4 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 11

Sound and Light as Physical Phenomena

Learners apply the wave model to sound and light. They relate loudness to intensity with the inverse-square law and the decibel scale, explain the Doppler effect, use c = fλ across the electromagnetic spectrum, calculate refraction with Snell's law and explain total internal reflection, and predict images formed by converging lenses with ray rules and the lens equation.

  • 4 lessons
  • About 120 min
  • Quiz: 10 questions

Science · Grade 11

Electric Charge, Fields and Potential

Learners explain charging as the transfer of electrons, with charge conserved and quantised, and use Coulomb's law to calculate electric forces and compare them with gravity. They model the space around charges as an electric field (E = F/q, E = kQ/r², field-line rules), define potential difference as energy per unit charge, and use uniform fields between plates and energy conservation (qV = ½mv²) to predict how charged particles move.

  • 5 lessons
  • About 120 min
  • Quiz: 10 questions

Science · Grade 11

Circuits and Electrical Energy

Learners treat current as a flow of conserved charge driven by a potential difference, use Ohm's law and current–voltage graphs to distinguish ohmic resistors from filament lamps, and apply the rules of series and parallel circuits, including combinations. They calculate electrical power, energy and cost in kilowatt-hours, then use a deliberately simplified bulb simulation, compare its predictions with real lamp data, and reason about parallel household wiring and fuses.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions

Science · Grade 11

Magnetism and Electromagnetic Models

Learners build the electromagnetic model step by step: magnetic fields of magnets and currents, the force on a current in a field and how it drives motors, electromagnetic induction and Lenz's law in generators, and transformers that make long-distance power transmission efficient. The course ends by connecting changing electric and magnetic fields to electromagnetic waves.

  • 4 lessons
  • About 125 min
  • Quiz: 10 questions

Science · Grade 11

A Physics Investigation with Reviewed Lab Evidence

The physics capstone is a complete investigation of how far a rolling car travels across a surface after leaving a ramp. Learners derive a prediction from energy conservation (distance proportional to release height, with gradient 1/μ), plan a safe fair test, process repeated measurements with uncertainties, find a gradient and intercept with maximum and minimum lines, and evaluate their evidence in a report reviewed by the teacher. A simulation provides practice data; an optional low-risk practical provides real evidence.

  • 4 lessons
  • About 130 min
  • Quiz: 10 questions

Science · Grade 12

Environmental Questions and Systems Thinking

Learners break real environmental questions into parts that evidence can answer and parts that values must decide, and name the Earth systems and disciplines each part involves. They then model environmental systems as stocks and flows, calculate residence times with units, trace reinforcing and balancing feedback loops, and finish by testing the assumptions that make a simple box model trustworthy or misleading.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 12

Ecosystems, Biodiversity and Change

Learners explain where biomes occur using temperature, precipitation and altitude, then measure biodiversity quantitatively with species richness, evenness and Simpson's diversity index. They classify ecosystem services, trace trophic cascades from keystone species, compare the resistance and resilience of ecosystems with disturbance data, and evaluate evidence about whether a changed ecosystem has recovered or shifted to a new state.

  • 5 lessons
  • About 115 min
  • Quiz: 10 questions
Free starter

Science · Grade 12

Populations and Resource Constraints

Learners treat a population as a stock with births and immigration flowing in and deaths and emigration flowing out. They calculate growth rates and doubling times with the rule of 70, explain the demographic transition, read age structures and dependency ratios to predict population momentum, and use logistic growth to reason about carrying capacity, overshoot and dieback. The course ends with ecological footprints, biocapacity and the IPAT relation, and with the limits of each measure.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 12

Earth Systems, Climate and Evidence

Learners build the physical case for climate change step by step. They describe the atmosphere's layers and lapse rate, calculate Earth's energy balance and explain the greenhouse effect at the molecular level, then track carbon between reservoirs in gigatonnes and parts per million. They analyse the carbon dioxide and temperature records, weigh independent lines of evidence for a human cause, and interpret feedbacks, climate sensitivity and model projections with their uncertainty ranges.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 12

Water, Soil and Land Use

Learners balance a watershed's water budget in millimetres and cubic metres, then follow water underground to explain how aquifers store and transmit it and to calculate how fast over-pumping lowers a water table. They compare water use by sector, separate withdrawal from consumption, and test claims about irrigation efficiency. Finally they explain how soils form and are layered, convert erosion rates into lost depth, and evaluate land-use and farming practices with data and tradeoffs.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 12

Energy Resources and Tradeoffs

Learners trace fossil, nuclear and renewable energy back to its origins and follow the conversions to electricity. They calculate efficiencies of devices and whole energy chains, separate power from energy, and use capacity factors to turn a plant's rating into realistic annual output. With life-cycle emissions intensities they compare sources fairly, and they finish by analysing multi-criteria tradeoffs: removing dominated options, weighting criteria and testing whether a ranking survives a change in priorities.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions

Science · Grade 12

Pollution, Measurement and Solutions

Learners classify air and water pollutants by source and chemistry, balance the reactions behind acid deposition, and measure pollution quantitatively in percent, ppm, ppb and mg/L against guideline values. They trace eutrophication from nutrient runoff to oxygen-starved water, interpret dissolved-oxygen data, and read dose–response curves, LD50 values, reference doses and biomagnification with attention to the limits of toxicity data. The course ends by comparing prevention, treatment and remediation by cost-effectiveness.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions

Science · Grade 12

Environmental Data and Uncertainty

Learners design environmental sampling plans and use a sampling simulation to see how sample size and bias affect estimates. They separate random from systematic measurement error, summarise repeated measurements with standard deviation and standard error, extract trends from noisy time series with units, and test causal claims against confounding, reverse causation and study design. The course ends with reporting and comparing results as ranges, so that conclusions match the strength of the data.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions

Science · Grade 12

Engineering for Sustainability

Learners act as sustainability engineers for a fictional rural school that needs safe water and a more comfortable building. They define the problem with measurable criteria and constraints, run simplified life-cycle assessments with functional units and break-even points, and design for reuse, repair and recycling using material-flow calculations. They then build a weighted decision matrix from raw data, normalising each criterion and testing its sensitivity, and apply everything to drinking-water treatment and to heat flow through a building's envelope.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 12

Policy Claims and Scientific Evidence

Environmental decisions mix scientific evidence with values and costs. Learners separate empirical claims from value judgements and recommendations, judge how strong the evidence behind a claim is, compare options with cost-effectiveness and benefit–cost reasoning under uncertainty, describe policy instruments neutrally, and communicate uncertainty honestly in a short evidence-based policy brief.

  • 5 lessons
  • About 125 min
  • Quiz: 10 questions

Science · Grade 12

Choose a Biology, Chemistry or Physics Extension

One environmental story, rising carbon dioxide, is examined through three disciplinary lenses. After a shared lesson on how each science frames questions, learners take a biology extension (ocean acidification and shell-building organisms), a chemistry extension (carbonate chemistry and the logarithmic pH scale) and a physics extension (Earth's radiation balance, albedo and solar energy). Teachers may assign one strand in depth; the quiz samples all three.

  • 4 lessons
  • About 130 min
  • Quiz: 11 questions

Science · Grade 12

A Senior Science Research Capstone

The capstone guides learners through a genuine small research project: framing a focused question from a source review, evaluating and citing sources, designing an ethical, safe sampling study, analysing data with means, uncertainty and trends, and communicating results through an abstract and peer review. A worked example follows a student lichen survey of roadside air quality; learners then plan and report their own study for teacher review.

  • 5 lessons
  • About 130 min
  • Quiz: 10 questions