Class 11th Physics Ch 7 Notes

• Important class 11 physics ch 7 exercise solutions from Punjab Textbook.
• What is harmonic oscillator? Give two examples: The oscillator motion, in which acceleration of the body at any instant is directly proportional to the displacement from the mean position and always directed towards the mean position is called simple harmonic motion. Example: • Motion of simple pendulum • Motion of mass attached to spring.
• Define SHM. Give two examples: The oscillator motion, in which acceleration of the body at any instant is directly proportional to the displacement from the mean position and always directed towards the mean position is called simple harmonic motion. Example: • Motion of simple pendulum • Motion of mass attached to spring.
• Define instantaneous displacement and amplitude: Ans: Instantaneous Displacement: The distance of the vibrating body at any instant from its mean position is called instantaneous displacement. It is denoted by “x”. The value of instantaneous displacement is zero at mean position while it has maximum value at the extreme position. Amplitude: The maximum value of displacement of the vibrating body on either sides from its mean position is called amplitude. It is denoted by “xo”.
• Define vibration, time period and frequency.
• Define Hook’s law. Write its formula.
• Important class 11 physics ch 7 question answer from Punjab Textbook.
• Define spring constant. Write its formula and unit.
• On which factors time period of mass spring system depends?
• Define simple pendulum. Write the formula of its time period.
• What is second pendulum? Calculate its frequency and length.
• What is the difference between free oscillations and forced oscillation?: Ans: Free Oscillation Forced Oscillation • A body is said to be executing free vibrations if it oscillates with its natural frequency without the interference of an external force. • A simple pendulum vibrates freely with its natural frequency that depends only upon the length of the pendulum. • A body is said to be executing forced oscillation if it oscillates with interference of an external force. • If the mass of vibrating pendulum is struck repeatedly, then forced oscillation is produced.
• What is resonance? Explain it with examples.
• Important class 11 physics ch 7 numerical from Punjab Textbook.
• What is difference between damped oscillations and un-damped oscillations?
• Name two characteristics of simple harmonic motion.
• Does frequency depends on amplitude for harmonic oscillations?
• Can we realize an ideal simple pendulum?
• What is the total distance travelled by an object moving with SHM in a time equal to its period, if its amplitude is A?
• What happens to the time period of the 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 the angle between maximum displacement and the driving force?
• 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 where the acceleration is greatest?
• Explain the relation between total energy, potential energy for a body oscillating with SHM?
• Describe some common phenomenon in which the resonance plays an important role?
• If a mass spring system is hung vertically and set into oscillation, why does motion eventually stop?