CHAPTER 7

361. When a particle execute repeated movement about a mean position, it is Harmonic motion

362. If a motion is repeated at regular intervals, it is called Periodic motion

363. The number of vibration completed by a body in one second is called Frequency

364. The unit of frequency is  Hertz / 1Hz / 1cs-1 / cps 365. The number of revolution per second of a body is called  Angular frequency         

366. In S.H.M the negative sign shows that both acceleration and displacement are Oppositely directed

367. Length of string + length of radius of metallic bob = Length of simple pendulum

368. The longer the pendulum the greater will be its  Time period

369. The time period of simple pendulum is independent to the  Mass of the bob

370. At extreme position K.E is Zero

371. At mean position K.E is Maximum

372. At extreme position the P.E is Maximum

373. At mean position the P.E is Zero

374. Law of conservation of energy is conserved in case of  S.H.M

375. The angle θ=    which specifies the displacement x as well as the direction of the motion of the point oscillating S.H.M is called Phase

376. Oscillations where amplitude becomes smaller and smaller with time are called  Damped oscillations

377. If the length of simple pendulum becomes fore times, its time period will become Two times

378. To find time period of simple pendulum we keep amplitude Small

379. Time period of simple pendulum is one second its length is 0.25 m

380. When the length of simple pendulum is increased four times, the frequency of its oscillation will  Half

381. If the length of simple pendulum is halved and mass is doubled then its time period Decreased by  4

382. Elastic collision involves  No gain no loss of energy

383. If tunnel is bored through center of earth and stone is dropped it will  Simple harmonic motion

384. The SI unit of spring constant (k) is identical to  Surface tension