Physics · Class 11 · Chapter 13
Oscillations
9 lessons87 min6 simulations10 practice questions
This chapter is about motion that goes back and forth about a fixed point: how to describe it with period, frequency, amplitude and phase, why a restoring force proportional to displacement gives simple harmonic motion, how energy moves between kinetic and potential forms, and why a pendulum swinging through small angles keeps time. It is the foundation for the next chapter on waves and for AC circuits in Class 12.
Also called: simple harmonic motion · SHM · pendulum
Lessons
9 lessons · 87 min
01Periodic and oscillatory motionNCERT §13.1, §13.26 min02Period, frequency and displacementNCERT §13.2.1, §13.2.27 min03Simple harmonic motion: amplitude, phase and angular frequencyNCERT §13.37 min04SHM as the shadow of uniform circular motionNCERT §13.410 min1 sim05Velocity and acceleration in SHMNCERT §13.57 min06Force law for SHM: F = −kxNCERT §13.616 min3 sims07Energy in SHMNCERT §13.710 min1 sim08The simple pendulumNCERT §13.810 min1 sim09Chapter reviewMust-know facts, traps and formulas14 min
Simulations
6 in this chapter
SHM as the shadow of a particle on a circleIn: SHM as the shadow of uniform circular motionBlock on a spring: what sets the period?In: Force law for SHM: F = −kxTwo springs, one blockIn: Force law for SHM: F = −kxIs it SHM? Plot a against xIn: Force law for SHM: F = −kxEnergy in SHM: where K equals UIn: Energy in SHMSimple pendulum: length, g and small swingsIn: The simple pendulum