Interactive science models

These models connect scientific ideas with probabilities, graphs and measurements. Each includes controls, a numerical table, a worked example and questions to try. Use the table if a graph is difficult to read; the controls work with a keyboard.

Inheritance and chance

Choose the parents’ alleles, predict the offspring and see why a small sample can differ from the expected ratio.

Reaction rates and gas-volume graphs

Change how quickly a reaction produces gas, then compare the curve, the measurements and the final gas amount.

Distance, velocity and acceleration

Change a vehicle’s motion and compare two graphs of the same journey. Follow the quantities on the axes carefully.

Use a model to test an idea

Before changing a control, write down what you expect. Change one value at a time so you can identify its effect. Compare the quantities and units, rather than relying only on the shape of a line.

A model simplifies the real situation. Read its assumptions before drawing a conclusion. Simulated offspring show random variation; calculated motion and reaction curves follow stated mathematical rules. None replaces supervised practical work.

Read worked science calculations or try generated calculations to practise the numerical steps.