Chapter 5: Work, Energy and Power
NCERT Class 11 Physics, Part I, Chapter 5. 6 lessons, 15 narrated 3D videos, 6 simulations and 12 quiz questions, following the textbook section by section.
- WorkIn everyday talk, studying for an exam is hard work. In physics, the word has a much narrower meaning.
- Kinetic energy and the work-energy theoremA fast cricket ball can knock the stumps flying. A moving body can do work on whatever it hits. We say it has energy.
- Potential energy and its conservationWater held high behind a dam can spin turbines when it is let go. A stretched bow can launch an arrow. Both store energy, ready to use.
- Potential energy of a springA spring is fixed to a wall at one end and to a block at the other. The block rests on a smooth floor. This is the relaxed position, x equals zero.
- PowerTwo students carry identical bags of books up the same staircase. One strolls up in a minute. The other runs up in fifteen seconds.
- CollisionsCarrom strikers, billiard balls, shunting railway wagons: collisions are everywhere. Let us see what stays the same when two bodies collide.