Draft Gravity: hierarchy of knowledge Gravitational force Solar system How is an expert’s understanding of the subject organised? Big idea Fields produce forces Gravitation, electric, and magnetic forces act at a distance. These can be explained by force fields that extend through space and can move other objects. Objects with mass cause attractive gravitational fields Electric and magnetic forces are different aspects of one interaction. Magnets cause magnetic fields and changing magnetic fields cause electric fields. Many devices use this interaction to generate motion and electricity. Unit concept Gravitational force Unit concept Weight Unit concept Solar system Sub-concepts Gravitational field strength Sub-concepts Planet, orbit, satellite, Facts Gravity decreases with distance Facts Weight = mass x g (field strength) Weight is in N, mass in kg Facts Spinning planet: axis, day length Phases and eclipses What scientific, maths, literacy and problem solving skills are developed? Skill area Draw conclusions Deduce a relationship from presented data Skill area Develop models Construct a model of a process or a system Draft Note: the content is in draft form and may change when published © Mastery Science, 2018

I can use my knowledge to Gravity: learning stages & objectives Astrophysicist Activate I understand earlier concepts Acquire I can make sense of the idea that .. Apply In unfamiliar situations, I can use the concept to .. Analyse I can use higher order thinking to .. Gravitational force Forces Every object exerts a gravitational force. Gravity holds planets and moons in orbit around larger bodies but depends on distance Explain effects of gravity on different planets Compare and contrast gravity with other forces Weight Forces Weight is the force an object exerts on its support and the force which causes it to fall. It is calculated from mass x gravitational field strength Solve word problems involving mass and weight using the weight formula Draw conclusions about activities on different planets, from gravity data Solar system Earth movement The solar system is modelled as planets rotating on tilted axes, orbiting the Sun. This explains day and year length, seasons and how planets and moons appear Explain why places on Earth experience different daylight or amounts of sunlight, from diagrams Interpret patterns in the properties of planets, from data Act I can use my knowledge to Explore how scientists discover properties of exoplanets, by simulating the transit method Note: the content is in draft form and may change when published © Mastery Science, 2018

(AQA Trilogy combined science) Gravity: national curriculum Which parts of KS3 are covered? AQA KS3 syllabus: 3.1.1 Gravity 3.7.2 Universe Which parts of GCSE are covered? (AQA Trilogy combined science) Gravitational force 6.5.1.3 Gravity Weight Draw conclusions WS 3.5 Draw conclusions from data Develop models WS 1.2 Use a variety of models What resources are there to teach this unit? Below are some ideas. Visit www.masteryscience.com to see more teaching & assessment resources, including: Advanced planners with teaching ideas for Acquire Mastery Practice Books to practise Apply Diagnostic and summative assessments for Acquire, Apply and Analyse Teaching ideas Act Use a lamp as the star, a ball on a stick as the exoplanet, and a webcam or light probe to measure light intensity. Students investigate the effect of size and speed of the exoplanet. Then, given light intensity plots for 'new' exoplanets, they make deductions. Note: the content is in draft form and may change when published © Mastery Science, 2018