Chapter 4: Laws of Motion
NCERT Class 11 Physics, Part I, Chapter 4. 6 lessons, 12 narrated 3D videos, 6 simulations and 12 quiz questions, following the textbook section by section.
- Inertia and the first lawPush a toy car across the floor and let go. It rolls for a while, slows down and stops.
- The second law, momentum and impulseA tennis ball and a cricket ball come at you at the same speed. Which would you rather stop? The cricket ball hurts more because it has more mass.
- The third law and conservation of momentumPress your hand against a wall. You push the wall, and you can feel the wall pushing back on your hand.
- Equilibrium and free-body diagramsA particle is in equilibrium when the net external force on it is zero. Then it is either at rest or moving with constant velocity.
- FrictionTry to push a heavy almirah across the floor. You push gently and nothing happens. Something is pushing back with exactly the same force.
- Cars on level and banked roadsA car goes round a curve at steady speed. Its direction keeps changing, so it is accelerating towards the centre of the curve.