This Microsoft PPT file contains the lecture notes for MYP Physics Years 4 & 5 chapter on Models. The slides' content flow is compatible with the first unit of Heathcote, William. (2018). MYP Physics: A concept-based approach Years 4&5. Oxford: Oxford University Press. However, it can also be used with other MYP Physics Years 4 & 5 textbooks. Content of the lecture:Activity - Modelling interior of a boxIntroductionAtomic modelsNature of electronStructure of atomActivity - Modelling the Geiger