3/5Inverse and inverse-square laws
COMING SOON · TOPIC 3 OF 5Inverse and inverse-square lawsy ∝ 1/x and y ∝ 1/x²: one trip at three speeds, sharing laddoos, a lamp and a wall, a spray can.This topic video is in production. Lesson 1 of 171: Proportion and scaling.The full course opens in January 2027.
Lesson 001: its 5 topics
- 1Direct proportiony ∝ x: litres and rupees, the test of a proportion; linear but not proportional (the auto fare)Topic 1 of 5Coming soon
- 2Square and cube lawsy ∝ x² and y ∝ x³: the roti, square plots and the square root, cubes and laddoos, surface and volumeTopic 2 of 5Coming soon
- 3Inverse and inverse-square lawsy ∝ 1/x and y ∝ 1/x²: one trip at three speeds, sharing laddoos, a lamp and a wall, a spray canTopic 3 of 5Coming soon
- 4Two changes at once and the power ruleA hidden quantity stays fixed; length over cross-section; the power rule, chains, spotting it from a table, fractional powersTopic 4 of 5Coming soon
- 5Reading a formula like a storyFormulas read as stories, exact percent changes, and how the exams ask proportionTopic 5 of 5Coming soon