Subscribe

JEE Animated: Samajhke Padho, Ace Karo

By Lalit, IIT Madras

JEE physics, drawn on the board as it is explained, one concept at a time.

Start SHM from lecture 1 Subscribe on YouTube

How a lecture works

  1. Drawn, not slides

    Every diagram and equation appears on the board as it is explained.

  2. Pause and try

    Every few minutes a question comes up with options; pause, try it, then watch the answer.

  3. Hinglish, physics in English

    Explained the way you talk, written the way the exam writes.

The chapter

Simple harmonic motion

26 lectures in order, the whole chapter in one sitting, a last-minute revision, and a test of all 225 questions.

The board from lecture 13: two stacked blocks on a spring, with (M + m)a = −kx and T = 2π√((M + m)/k).
From lecture 13

The 26 lectures, in order

  1. 1What is SHM? Periodic, oscillatory and simple harmonic motion
  2. 2Force, acceleration and speed through one SHM oscillation
  3. 3SHM is the shadow of circular motion: the reference circle
  4. 4Speed at any position in SHM, and the time period of a spring-block
  5. 5x = A sin(ωt + φ): the SHM equation, term by term
  6. 6All six SHM graphs: x, v and a against time and each other
  7. 7The phasor diagram: SHM phase questions in one picture
  8. 8Finding the SHM phase constant from where the particle starts
  9. 9Time between two positions in SHM, and when two oscillators meet
  10. 10Energy in SHM: why KE and PE repeat at twice the frequency
  11. 11How to prove a motion is SHM, and k effective
  12. 12SHM of a vertical spring, a block on a slope, and a bullet hitting it
  13. 13Stacked blocks in SHM: when does the top block slip or lift off?
  14. 14Springs in series and parallel in SHM: the k effective of each
  15. 15Pulleys with springs, and springs at an angle
  16. 16Simple pendulum in SHM: T = 2π√(L/g), and why it needs small angles
  17. 17Angular SHM: torque instead of force
  18. 18Physical pendulum and torsional pendulum
  19. 19Superposition of SHMs: adding with phasors, and perpendicular SHMs
  20. 20A plank on two rotating rollers: prove SHM and find T
  21. 21Damped oscillations: why the amplitude dies out
  22. 22Forced oscillations and resonance
  23. 23Underdamped, overdamped and critically damped motion
  24. 24Drop a ball into a tunnel through the Earth: it does SHM
  25. 25A particle on the axis of a ring does SHM under gravity
  26. 26Floating body, U-tube liquid and a loaded wire: three SHMs

Every chapter, drawn the same way.

Subscribe
The board from lecture 24: a tunnel through the Earth, with T = 2π√(R/g).
From lecture 24