GCSE higher, inverse proportion activity/worksheet. Mathematics, Physics cross-curricular task based on applying the inverse square law to Newton’s laws of gravity. In this real life application of inverse proportion, pupils will investigate how gravity fields on various planets are inversely proportional to their radius and, subsequently, how they are related to their mass. This is followed by some particularly testing questions to really check pupil’s mathematical, physical and logical reasoning. Answers and internet links included.