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

20 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 9

Biological Questions, Safety and Evidence

Learners turn observations of living things into testable questions, hypotheses and predictions, and learn what observational and experimental evidence can each show. They plan safe and ethical biology work, design controlled experiments that allow for biological variability, analyse data with means, ranges and percentage change, and use microscope calculations to measure cells.

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

Science · Grade 9

Chemistry of Life and Biological Molecules

Learners explain how the polarity of water and hydrogen bonding give water the properties living things depend on, classify carbohydrates, lipids, proteins and nucleic acids by their building blocks and functions, and write balanced equations for the condensation and hydrolysis reactions that build and break them. They finish by modelling enzymes as shaped protein catalysts and interpreting temperature, pH and rate data, including denaturation.

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

Science · Grade 9

Cells, Membranes and Transport

Learners compare prokaryotic and eukaryotic cells and follow a protein through the organelles that make and export it. They model the cell membrane as a phospholipid bilayer studded with proteins, explain and predict diffusion and osmosis in animal and plant cells using real-style data, distinguish passive, active and bulk transport by energy use and direction, and calculate surface-area-to-volume ratios to explain why cells stay small.

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

Science · Grade 9

Energy in Living Systems

Learners explain ATP as the energy currency that links energy-releasing and energy-using processes, then model photosynthesis and cellular respiration with balanced equations, organelle locations and stages. They analyse limiting factors and the balance between photosynthesis and respiration with a growth model and gas-exchange data, and finish by tracking atoms and energy through plants, animals and decomposers, including where a tree's mass comes from.

  • 5 lessons
  • About 125 min
  • Quiz: 11 questions
Free starter

Science · Grade 9

Cell Division and Growth

Learners model the cell cycle and mitosis, track chromosome and DNA numbers through each stage, and estimate how long each phase lasts from root-tip counts. They explain how checkpoints and control genes keep division in check and how cancer arises when that control is lost, then explore how differentiation and stem cells turn one fertilised egg into many specialised cell types, including the scientific and ethical questions stem cell research raises.

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

Science · Grade 9

Heredity and Genetic Models

Learners explain how meiosis makes haploid gametes and shuffles alleles, then use Mendel's model, Punnett squares and the rules of probability to predict monohybrid and dihybrid crosses as fractions and expected counts. They extend the model to incomplete dominance, codominance, multiple alleles and sex-linked traits, and finish by reading pedigrees to infer how a trait is inherited and to calculate family probabilities.

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

Science · Grade 9

DNA, Gene Expression and Biotechnology

Learners model DNA's structure and its semi-conservative replication, then follow a gene to a protein by transcribing DNA and translating mRNA with a codon table. They classify mutations and predict their effects, explain how genes are switched on and off, and finish with the science and ethics of PCR, gel electrophoresis and gene editing.

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

Science · Grade 9

Evolution and Evidence

Learners explain natural selection as a mechanism acting on heritable variation, weigh fossil, anatomical, embryological, molecular and biogeographic evidence for common ancestry, and measure evolution as changing allele frequencies, including the role of chance in small populations. They finish by explaining how reproductive isolation produces new species and by reading cladograms built from shared derived characters.

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

Science · Grade 9

Ecological Relationships and Populations

Learners model population growth with exponential and logistic equations, explain carrying capacity with density-dependent and density-independent limiting factors, and analyse predator–prey cycles with a simulation whose rule they take apart. They classify species interactions by their effects on each partner and estimate real population sizes with quadrats and mark–recapture, stating the assumptions behind every estimate.

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

Science · Grade 9

Matter and Energy in Ecosystems

Learners place organisms at trophic levels in food webs, calculate gross and net primary production and the efficiency of energy transfer between levels, and explain pyramids of numbers, biomass and energy, including inverted ones. They then model the carbon cycle at ecosystem and global scale, including anaerobic decomposition and fossil carbon, and the nitrogen cycle with its microbes, writing balanced equations for key steps.

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

Science · Grade 9

Human Impacts and Biological Solutions

Learners analyse how habitat loss and fragmentation, invasive species, overharvesting, pollution and climate change affect populations, using species–area, sustainable-yield, biomagnification and timing data. They explain why biodiversity and genetic diversity matter for ecosystem services and resilience, and finish by evaluating conservation and restoration solutions with criteria, constraints, weighted decision matrices and monitoring data.

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

Science · Grade 9

A Biology Investigation with Reviewed Lab Evidence

In this capstone, learners carry out a complete biology investigation into how light affects seedling growth. They plan it with variables, controls, replication and a risk assessment, run a virtual lab and process its data into a graph with a meaningful gradient, analyse a realistic class data set with means, uncertainties and anomalies, evaluate errors, validity and the limits of virtual labs, and write report sections that a teacher reviews.

  • 5 lessons
  • About 130 min
  • Quiz: 12 questions