Chapter 4: Laws of Motion

Laws of Motion is the chapter where physics stops merely describing motion and starts explaining it — the kinematics of straight lines and circles finally gets its causes. This hub maps the complete chapter: Aristotle's fallacy and Galileo's law of inertia leading to Newton's first law, the second law as F = dp/dt with impulse, the third law and its pair discipline, conservation of linear momentum with recoil problems, equilibrium of concurrent forces with Lami's theorem, the common forces catalogue (weight, normal, tension, spring), friction in its static, kinetic, rolling and lubricated forms, circular motion dynamics including the level-road speed limit and banking of roads, and the free-body-diagram method that converts all of the above into marks. The exam pattern is equally predictable: F = ma numericals, impulse–momentum items, friction on inclines, lift apparent-weight readings, banking speed formulas, and conceptual MCQs hunting for students who cancel action–reaction pairs. Work through the nine topic pages below in order, drill each page's practice questions, then sit the 30-question chapter test with its full answer key.