These links will direct you to interactive simulations that are available for free.

It is recommended that after completing a section of work, you carefully open all the simulations related to the section. Identify which simulation(s) you would like to view/try, and then click on the name of the link. Read the content of what the simulation will indicate. Next, click on the ‘view online (free)’ button. This will take you through to the simulation. Use the simulation as instructed in the content next to the ‘view online (free)’ button.

It is recommended that, once a section has been taught or learnt, demonstrate all the appropriate simulations from the section concerned. This should assist with the understanding of the section concerned. There are about 1000 simulations – most of them applicable to Grades 10, 11 & 12 CAPS Curriculum.

The best part is – these are FREE to view!
Enjoy, have fun – good luck!
John Bransby

About Absorb Online Courses

Absorb is a series of interactive online courses for secondary schools, covering physics, chemistry, electronics, mathematics and advanced physics. Our unique simulations, interactive animations, and videos, are linked by an involving narrative, providing the basis for an interactive learning experience.

Each title offers a huge amount of interactivity – ranging from simple animations that show hidden concepts, to powerful models that allow flexible experimentation. Each title is well-suited to self-study or review, or provides a framework to teach in front of the whole class on a whiteboard.

Click on buttons to read more about:










If you do not have Java Script already on your computer, you will need to download it from this link in order to open these simulations:

Test it out by clicking on this link: An electric motor

[table type=”simple”]


1. Atoms & matter
Pressure experiment Air molecules bombarding a smoke particle
Diffusion in a gas The atoms in a gas
The atoms in a solid The atoms in a liquid
Changes of state Smoke in a microscope
Pressure-temperature graph
2. Domestic Electricity
Domestic wiring A domestic plug
A circuit breaker Warming a room: convection heater
Warming a room: electric fire A 13A domestic plug
Bar heater Part of an electricity bill: blank
Radiator Electricity meter: initial reading
Electric meter: final reading Part of an electricity bill
2. Electric Charge
Investigating conduction A gold-leaf electroscope
Static electricity picking up paper A negatively charged balloon
Spraying a car Current flow: iron wire
Current flow: long wire Current flow: thin wire
Current flow: hot wire A lithium atom
Current flow Current flow: copper wire
One polythene and one acetate strip Two positively charged acetate strips
Two negatively charged polythene strips
3. Electric circuits
A blank current-voltage graph The cell: an electron pump
4. Electromagnetic effects
An electric motor Electric cable power loss
Generating electricity Graphing a.c. current
Plotting a.c. current Magnets: aligned in the same way
Magnets: aligned in opposite directions Energy changes: hydroelectric power station
Energy changes: coal-burning power station Right-hand grip rule
Magnetic field: the Earth Magnetic fields (bar magnets): question 2
Power transmission Magnetic fields (solenoids): question 1
Magnetic fields (bar magnets): question 3 A compass
Magnetic fields (bar magnets): question 1 Oersted’s experiment
Magnetic field: solenoid A moving wire in a magnetic field: measuring the induced current
Magnetic field: bar magnet A wire in a magnetic field
A moving magnet in a coil A moving wire in a magnetic field
Fleming’s right-hand rule Fleming’s left-hand rule
5. Forces
The unbalanced force on a ball Forces on a football
A rocket taking off A man pushing a crate
Forces on a sailing boat Forces on a raindrop
An apple hanging from a tree Terminal velocity of a skydiver
Demonstrating inertia by pulling tablecloth Two magnets repelling each other
Graph of terminal velocity during a parachute jump An electromagnet picking up a car
Friction between rough surfaces (microscopic view) Friction reduced with surface lubrication (microscopic view)
Friction between smooth surfaces (microscopic view) Friction reduced by rolling (microscopic view)
A foot crushing a drinks can One polythene and one acetate strip
Two positively charged acetate strips Two negatively charged polythene strips
6. Forces & materials
A hydraulic jack A simple hydraulic machine
Boyle’s Law A natural power shower
Two drawing pins 2 Bicycle tyres
Two drawing pins 1 Hydraulic brake system
Car tyres Investigating weight and upthrust
Hooke’s Law experiment: spring Hooke’s Law experiment: wire
The depth of water in open tubes Pressure caused by a box on the ground
7. Heat & energy transfer
Renewable energy Insulation: house
Temperature and thermal energy Testing materials for conduction
Insulation: vacuum flask Adding heat to water
Heat flow: pan handle Convection currents: Bunsen burner
Energy resources Conduction: question 2
Energy use: a power station and an electric motor Double glazing
Conduction: question 1 Energy use: a power station
Energy use: a person Heat flow: heater
Water – heat conduction Heat flow: sun to Earth
Evaporation: two water containers Energy use: an electric motor
Energy consumption Energy use: a car
Heat flow: cup of coffee Convection currents: beaker of water
Evaporation: hot water
8. Levers & machines
Balancing a seesaw Lifting a rock with a shovel
Centre of mass of a wooden shape Balancing a bottle
A pedal: vertical crankshaft A pedal: diagonal crankshaft
A vertically balanced fat marker pen A very stable marker pen
Moments: finding the perpendicular distance A horizontally balanced pencil
A pedal: horizontal crankshaft
9. Light as a wave
Converging lens Diverging lens
Newton’s wheel Human eye: blank
Refraction of light Reflection 1: diagram
Reflection 2: leaf Optical fibre close up: 2
Reflection 5: virtual source Reflection 3: blank
Reflection 6: angled mirrors Optical fibre close up: 3
Reflection 4: lamp and mirror Optical fibre close up: 1
Human eye
10. Motion
Distance and displacement of a moving ball Velocity-time graph: Example
Blank distance-time graph Distance-time graph: Example 4
Distance-time graph: Example 1 Distance-time graph: Example 2
Distance-time graph: Example 3 Distance-time graph: Example 5
11. Radioactivity
Carbon-14 decay A radioactive source and an electroscope
Ionising air Carbon dating: graph
A neutral atom Carbon dating
The first ten elements Radiation penetration
Investigating gamma ray absorption Uranium decay
Chain reaction Nuclear fusion in a star
Average annual gamma ray exposure A hydrogen atom
A helium atom Gamma radiation
An alpha particle A beta particle
Rutherford’s experiment The plum pudding model
12. EM Spectrum
Properties of X-rays The electromagnetic spectrum: blank
The greenhouse effect The electromagnetic spectrum
UV radiation IR camera
Sending messages around the world
13. The Universe
The Earth’s rotation Life of a star: birth
Life of a star: later life of a small star The period of a satellite
Gravitational attraction Moon in orbit
Seasons Local time
A comet Water waves produced by a dipper
The solar system The Earth orbiting the Sun
Orbiting cannon ball
14. Waves
Combining waves 2: destructive interference Water waves diffraction
Sound waves: vibrating cymbal Circular wave interference
Real waves on water A wave in traffic
Changing water depth Water wave refraction
Wavelength: a diagram Typical transverse wave
A ripple tank A moving wave
A ripple tank Amplitude: a diagram
Interference question: 1 Typical wave: Example 2
Interference question: answer Typical wave: Example 1
Interference question: 2 Interference question: 3
Reflection: string of beads Combining waves 1: constructive interference
A wave: shaking beads on a string A wave: squeezing a spring
Reflection: spring Ripple tank: circular wave reflection
Ripple tank: oblique reflection A ripple tank: variable frequency
Ripple tank: head-on reflection A Mexican wave
The electromagnetic spectrum UV radiation
15. Waves in action
Layers in the Earth Sound waves: fast-moving plane
A typical seismogram Seismic waves in the Earth 1
Seismic waves in the Earth 2 Cymbal in bell jar
Sound waves: slow-moving plane Typical sound frequencies
Wave Bell in a bell jar
Drifting continents Earth cross-section: blank
16. Work Energy & Power
Factors affecting stopping distances Reaction time test
An investigation into stopping distances Energy transfer and work done
A man doing work by pushing a crate A chairlift
Nutritional information

More Advanced Physics Simulations

1. Basic electricity
Graph for I-V characteristics of an ohmic resistors Potential difference and electron drift
A variable resistor Generating alternating currents
Current in a circuit Current in parallel resistors
Current in cold and hot wires Current in long and short wires
Direct current from moving charges Electron transfer
Measuring electron drift Ohm’s equation calculator
Resistor colours A resistor
Resistor tolerance colours
2. Dynamics
The vector adder 2 The forces on an accelerating car
Galileo’s thought experiment Resolving vectors 2
Crash test dummy 1 A car towing a caravan 1
Resolving vectors 1 Adding vectors
A car towing a caravan 2 The vector adder 1
Combing components Weight and mass on other planets
Accelerating lorry A search area
3. Heat retention & flow
Heat exchange in a power station Thermal equilibrium
Melting ice Calibrating a thermometer
Measuring the latent heat of vaporisation Heating and insulation
Measuring the latent heat of fusion 2 Heating different volumes of water
Measuring the latent heat of fusion 1 Heat loss in a house
Heating water A radiator
Cooling stearic acid
4. Kinematics
Distance-time graph Motorcycle jump
Velocity-time graphs and stopping distances 1 Velocity-time graphs and stopping distances 2
Increasing acceleration Plotting a distance-time graph with a sound detector
Firing a cannonball 1 Firing a cannonball 2
Accelerating a car Firing a cannonball 3
Plotting a distance-time graph Distance-time graphs and speed
Calculating speeds with two light gates Car acceleration
Falling ball 1 Calculating speeds with one light gate
Falling ball 2 Calculating acceleration with one light gate
Calculating acceleration with two light gates Horizontal and vertical motion
Map and bearing 1 Calculating average speeds
Rolling trolley Map and bearing 2
A golfer A jumping motorcycle
5. Mechanical properties
Stress-strain graph for elastic material Properties of materials used in building a space shuttle
Atomic forces 1 Sodium chloride structure 1
Sodium chloride structure 2 Cubic structure
The periodic table Basic face centred cubic structure
Basic body centred cubic structure Hexagonal close packing
6. Momentum & energy
Hitting a golf ball Crash test dummy 2
Anatomy of a collision Forces during a collision
Separating masses Linear air track
Weightlifting Weightlifting and power
7. Oscilliations & SHM
Comparing oscillations and rotations Resonance
Comparing graphs Forces on a pendulum
Forces on a spring 2
8. Pressure & up-thrust
Boyle’s Law 1 Explaining Charles’ Law
Pressure-temperature experiment 1 Investigating the Ideal Gas Law
Boyle’s Law 2 A submarine
Extrapolating the pressure-temperature graph Pressure-temperature experiment 2: absolute temperature
Temperature converter Upthrust experiment
Charles’ Law 1 Charles’ Law 3: absolute temperature
Maxwell-Boltzmann distribution Collapsing can
Determining atmospheric pressure Pressure and depth
A pressure cooker Gas molecules
Charles’ Law 2 Floating and sinking
Sucking through a straw Pressure and direction
Aerofoil Floating
A diver Bernoulli’s principle
Scent sprayer
9. Statics & moments
Factors affecting static friction A balance beam
Limiting friction Resolving forces in equilibrium
Balanced forces Forces in equilibrium
A long handled spanner Total torque
A tower crane model Lifting a weight
A painter on a trestle 2 A painter on a trestle 1
Frictional forces acting on a block on a slope Frictional forces acting on a block
A car’s steering wheel Balance beams and torque
Baby and pram

Chemistry simulations

1. Acids, alkalis & salts
Reacting lead nitrate and sodium iodide 1 Reacting iron with chlorine
The pH scale Reacting lead nitrate and sodium iodide 2
2. Bonding
Forming ionic bonds: sodium chloride Forming ionic bonds: magnesium chloride
Boiling water Forming covalent bonds: oxygen
Forming covalent bonds: carbon dioxide Forming covalent bonds: methane
Forming covalent bonds: chlorine Forming covalent bonds: water
Comparison of metals and alloys Dissolving ionic solids
Forming magnesium chloride ions Why metals conduct electricity
Giant ionic lattices The structure of graphite
The structure of diamond Why graphite conducts electricity
Cleaving crystals Balancing ionic formulae 1
 “ Ball  and  stick”  di agrams  “ Dot  and  cr oss”  di agr ams
Balancing ionic formulae 2 The structure of carbon-60
Basic body centred cubic structure Hexagonal close packing
3. Chemical calculations
Calculating the relative molecular mass of water Titration
Relative atomic mass Moles in chemical equations
Reducing copper oxide Volume and moles
Moles in solution Moles of a gas
4. Chemical energy
Acid rain The fire triangle
The Earth and the greenhouse effect A catalytic converter
Testing the products of burning wax 1 Reaction pathway: forming HCl
Testing the products of burning wax 2 Reaction pathway: exothermic
Reaction pathway: endothermic Bond breaking
Bond making Global average temperature changes
5. Chemical shorthand
Reacting aluminium and iodine Reacting hydrogen and oxygen
Decomposing ammonium dichromate (VI) Reacting zinc and sulfur
Reacting potassium and water Hydrogen and oxygen reaction 4
Heating and cooling zinc oxide A balanced chemical equation
Hydrogen and oxygen reaction 2 Hydrogen and oxygen reaction 1
Hydrogen and oxygen reaction 3
6. Electrolysis
Electrolysis of aluminium oxide Electrolysis of sodium chloride
Electrolysis of lead bromide: reactions at the electrodes Electrolysis of brine: membrane cell
Solution mining of brine Electrolysis of lead bromide
Electrolysis of potassium nitrate Copper-zinc cell: reactions at the electrodes
Purifying copper 2 Electrolysis of copper chromate
Half-cell voltages 1 Electrolysis of brine: reactions at the electrodes
Electrolysis of brine products Purifying copper 1
Electrolysis of copper chloride Electrolytes and conduction 1
Forming an electrolyte Electrolytes and conduction 3
Electrolysis of potassium manganate (VII) Electrolytes and conduction 2
Half-cell voltages 2 Electrolysis of copper chloride: experimental set-up
Electrolysis of aluminium oxide: experimental set-up Electroplating
Electrolysis of sodium chloride: products Electrolysis of lead bromide: experimental set-up
Copper-zinc cell Fuel cell
Fuel cell: unlabelled
7. Equilibria
Comparing hydrochloric and ethanoic acids Dynamic equilibrium model
Dissolving hydrogen chloride in water Equilibrium and temperature
Heating ammonium chloride Mixing ammonia gas and hydrogen chloride gas
Equilibrium and pressure Ethanoic acid
8. Extraction of metals
A blast furnace Extracting titanium
Making steel Heating carbon and lead oxide
Carbon and the reactivity series Extracting a metal
Displacing lead from lead oxide
9. Oil industry
Oil formation Uses of crude oil
Explaining the distillation of crude oil Properties of crude oil fractions: pouring
Properties of crude oil fractions: combustion Distilling crude oil
Alkanes Polymerising ethene
Making nylon Cracking hydrocarbons
Monomers and polymers Testing for unsaturated hydrocarbons
Alkanes in crude oil
10. Organic chemistry
Alkane and alcohol boiling points Esterification
Forming starch Hydrolysing starch
Forming cellulose Alcohols
Dehydrating sugar Condensation polymerization
Equivalent structures 1 Hydrolysing fats
The formation of a fat Equivalent structures 2
Hydrolysing proteins
11. Particles
Heating a solid Melting a solid
Heating stearic acid Convection currents: beaker of water
Evaporation: hot water Diffusion in a gas
The atoms in a gas Cooling stearic acid
The atoms in a solid The atoms in a liquid
Changes of state Smoke in a microscope
12. Rates of reaction
Explaining reaction rates and concentration Explaining reaction rates and surface area
Explaining reaction rates and temperature Reaction rates and temperature 1
Reaction rates and catalysts Reaction rates and surface area
Explaining reaction rates and pressure Reaction rates and concentration
The ‘Iodine clock’ experiment Reaction rates and enzymes
Measuring reaction rates: volume of gas given off 2 Measuring reaction rates: mass of gas given off
Explaining reaction rates and catalysts Collision theory
Heating magnesium ribbon Measuring reaction rates: forming a precipitate
Reaction rates and temperature 2 Enzymes and pH
Enzymes and temperature Measuring reaction rates: volume of gas given off 1
A graph of the reaction rate Explaining reaction rates and enzymes
Heating magnesium powder Reaction rates
13. Atomic structure
Electronic structure of the first 20 elements Bohr’s model of the atom
Thomson’s experiment Rutherford’s model of the atom
Atomic number and mass number Molecules reacting
Isotopes of carbon Isotopes of hydrogen
Atomic number Basic face centred cubic structure
Rutherford’s experiment The plum pudding model
14. Periodic table
The periodic table: electronic structure The periodic table: elements
The periodic table: metals and non-metals The periodic table: groups
The periodic table: periods Burning sodium in oxygen
Burning carbon in oxygen Burning sulfur in oxygen
Burning potassium in oxygen The periodic table: some transition metals
Group VII: reacting bromine with iron Heating copper carbonate
Reacting iron with dilute sulfuric acid Burning iron in oxygen
Group I: reacting potassium with water Group I: reacting sodium with water
Group VII: reacting iodine with iron Group VII: reacting chlorine with iron
Group I: reacting lithium with water Group II: reactions with dilute HCl
Forming covalent bonds: hydrogen chloride Group II: reactions with water
Mendeleev’s periodic table Testing the pH of calcium oxide
Group I: potassium ion Testing the pH of phosphorus pentoxide
Testing the pH of potassium oxide Group I: lithium ion
Testing the pH of sulfur dioxide Group I: cutting lithium
Group I: cutting potassium Testing the pH of carbon dioxide
Reacting chlorine with water Group I: cutting sodium
The properties of non-metals Noble gases: boiling points
The properties of metals Noble gases: densities
The periodic table
15. Reactivity series
Reacting magnesium with steam Reacting zinc and lead nitrate
The thermite reaction Reactions of metals
Anodising aluminium Reacting magnesium with dilute sulfuric acid
Burning magnesium in oxygen Reacting zinc with dilute sulfuric acid
Reacting lead with dilute sulfuric acid Reacting tin with dilute sulfuric acid
Hydrogen in the reactivity series. The reactivity series
Investigating the causes of rust Displacing ions
16. Water
Eutrophication Water treatment: reservoir to tap
Ion-exchange column Testing for the sulfate ion
Testing for halide ions Testing for copper and iron ions
Water hardness Testing for the nitrate ion
Calcium and magnesium flame tests The water cycle
Potassium flame test Sodium flame test
Lithium flame test Barium flame test
Distilling a solution Water as a solvent
Fractional distillation Thermal pollution
A spectrophotometer Water treatment