Class 11th Physics Chapter 7 Notes

Important Easy to understand Class 11th Physics Chapter 7 Notes Oscillations written by Professor Mr. Asad Abbas Suib. These notes are very helpful in the preparation of class 11th physics chapter 7 important questions for students of the 11th class and these are according to the paper patterns of all Punjab Book Boards.

Summary and Contents:
Topics which are discussed in the notes are given below:
  • Very Important Multiple Choice Questions class 11th physics chapter 7 mcq with Answers of the Chapter No. 7: Oscillations in 1st Year Physics Punjab Book Boards.
  • Oscillatory motion/vibratory motion
  • Definition of Periodic Motion
  • Definition of Restoring force
  • Important class 11th physics chapter 7 question answer from Punjab Textbook.
  • Requirements for oscillations
  • How oscillations are produced
  • State Hook's Law and Spring Constant 
  • State Simple harmonic motion
  • Characteristics of wave form of SHM
  • Definition of Instantaneous displacement
  • Important class 11th physics chapter 7 exercise from Punjab Textbook.
  • Definition of Amplitude
  • Definition of Vibration
  • Definition of Time period
  • Definition of Frequency
  • Definition of Angular frequency
  • What is Phase? Give its two cases.
  • Write a note on characteristics of Horizontal mass spring system.
  • What is Simple pendulum? Prove that motion of simple pendulum is SHM. Also derive the relation for time period of simple pendulum.
  • Explain Energy conservation in SHM.
  • What are Free and forced oscillations? Give example of each.
  • What is Resonance? Describe Barton pendulum experiment. And examples of resonance.
  • What is undamped and damped oscillations? Also define damping.
  • What is Effect of damping on vibration of a body?
  • What is Sharpness of resonance? 
  • Name two characteristics of simple harmonic motion. 
  • Does frequency depends on amplitude for harmonic oscillators?
  • Can we realize an ideal simple pendulum?
  • What is the total distance traveled by an object moving with SHM in a time equal to its period, if its amplitude is A?
  • What happens to the period of a simple pendulum if its length is doubled? What happens if the suspended mass is doubled?
  • Does the acceleration of a simple harmonic oscillator remain constant during its motion? Is the acceleration ever zero? Explain.
  • What is meant by phase angle? Does it define angle between maximum displacement and the driving force? i) Phase angle (or phase):
  • Under what conditions does the addition of two simple harmonic motions produce a resultant, which is also simple harmonic?
  • Show that in SHM the acceleration is zero when the velocity is greatest and the velocity is zero when the acceleration is greatest.
  • In relation to SHM, explain the equations;
  • Important class 11th physics chapter 7 numericals from Punjab Textbook.
  • Describe some common phenomena in which resonance plays an important role.
  • If a mass spring system is hung vertically and set into oscillations, why does the motion eventually stop?
  • A 100.0 g body hung on a spring elongates the spring by 4.0cm. When a certain object is hung on the spring and set vibrating, its period is 0.568s. What is the mass of the object pulling the spring?
  • A load of 15.0g elongates a spring by 2.00 cm. If body of mass 294 g is attached to the spring and is into vibration with an amplitude of 10.0 cm, what will be its (i) period (ii) spring constant (iii) maximum speed of its vibration.
  • An 8.0kg body executes SHM with amplitude 30 cm. The restoring force is 60 N when the displacement is 30 cm. Find (i) Period (ii) Acceleration, speed, kinetic energy and potential energy when the displacement is 12m.
  • A block of mass 4.0 kg is dropped from a height of 0.80 m on to a spring of spring constant k = 1960 Nm-1, Find the maximum distance through which the spring will be compressed. 
  • A simple pendulum is 50.0 cm long. What will be its frequency of vibration at a place where g = 9.8 ms-2?
  • A block of mass 1.6 kg is attached to a spring with spring constant 1000 Nm-1, as shown in Fig.7.14. The spring is compressed through a distance of 2.0 cm and the block is released from rest. Calculate the velocity of the block as it passes through the equilibrium position, x=0, if the surface is frictionless. 
  • A car of mass 1300 kg is constructed using a frame supported by four springs. Each spring has a spring constant 20,000 Nm-1. If two people riding in the car have a combined mass of 160 kg, find the frequency of vibration of the car, when it is driven over a pot hole in the road. Assume the weight is evenly distributed. 
  • Find the amplitude, frequency and period of an object vibrating at the end of spring, if the equation for its position, as a function of time, is x= 0.25 cos(pi/8)t what is the displacement of the object after 2.0s?  



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