Physics · Class 11 · Chapter 4
Laws of Motion
11 lessons 104 min 4 simulations 9 practice questions
This chapter moves from describing motion to explaining it. It builds Newton's three laws from the idea of inertia, introduces momentum and impulse, shows how momentum conservation follows, and then applies the laws to the forces met most often in mechanics: weight, normal reaction, tension, spring force, friction and the centripetal force needed for circular motion.
What the exam asks
NEET turns this chapter into free-body-diagram numericals: blocks joined by strings over pulleys, friction on horizontal floors, apparent weight in a lift, impulse on a rebounding ball, recoil, and a car on a level or banked curve. Marks are lost by always writing friction as μN, by forgetting that velocity reverses in a rebound, and by treating an action-reaction pair as two forces that cancel.
Lessons
11 lessons · 104 min
1Aristotle's fallacy and the law of inertiaNCERT § "Aristotle's Fallacy" and § "The Law of Inertia"7 min2Newton's first law of motionNCERT § "Newton's First Law of Motion"8 min3Newton's second law, momentum and impulseNCERT § "Newton's Second Law of Motion"11 min 1 sim4Newton's third law of motionNCERT § "Newton's Third Law of Motion"7 min5Conservation of momentumNCERT § "Conservation of Momentum"7 min6Equilibrium of a particleNCERT § "Equilibrium of a Particle"7 min7Common forces in mechanicsNCERT § "Common Forces in Mechanics"7 min8FrictionNCERT § "Friction"11 min 1 sim9Circular motionNCERT § "Circular Motion"11 min 1 sim10Solving problems in mechanicsNCERT § "Solving Problems in Mechanics"12 min 1 sim11Chapter reviewMust-know facts, traps and formulas16 min