Chapter 8 physics wave sound and motion 11th physics || Agha Haseebullah Khan Sindh || textbook board jamshoro
Periodic Motion:
The motion which repeats after the fixed interval of time or equal interval of time is called periodic motion
The motion which repeats after the fixed interval of time or equal interval of time is called
periodic motion.
A motion which repeats itself in equal interval of time is called periodic motion.
Examples: Earth revolves in 24 hours, Swing motion, Rocking Chair.
Note: Only vibratory motion is not only periodic motion but also circular motion is periodic
motion.
A motion which repeats in equal interval of time is called periodic motion.
Vibratory Motion: To and fro motion is called vibratory motion
Back and forth motion is called vibratory motion.
Vibration: One complete round trip of vibratory body is called vibration.
Frequency or Pitch:
Number of oscillations per unit time is called frequency.
Vibration per second or cycles per seconds.
Pitch term is used only for frequency of sound.
Frequency of rocking chair is not pitch.
S.I unit of frequency is cycles per second (ଵ
or Hertz (Hz).
Symbol of frequency is (Nu).
It is reciprocal of time period.
Simple Harmonic Motion:
Simple Harmonic motion is a special type of (force) periodic motion where the restoring
forces on the moving displacement of object and acts towards the equilibrium position of
object.
Acceleration acting on a body is directly proportional to the displacement of the body
measured from its equilibrium position.
A vibratory or ‘to and fro’ motion in which acceleration us directly proportional to –ve
displacement.
SHM is always directed towards its mean or equilibrium position.
Acceleration and displacement are always in opposite (a -x ) direction.
The negative sign shows the direction of acceleration is always towards centre.
Watch this video to understand conceptually 👇👇👇👇 the given above topics
Hook’s Law or Mass Spring System:
It states that with in elastic limit the elastic restoring force is directly proportional to
displacement.
When an elastic spring is stretched by a force, the force exerted the spring is directly
proportional to the displacement. This is known as Hook’s law.
F - x
F = - K x .
K is spring constant or Hook’s constant.
Elastic Restoring Force:
He stated that within elastic limit the elastic restoring force is directly proportional to the
displacement.
F -x
F = -Kx
S.I unit is N/m.
The negative sign shows that the applied force is always opposite to the spring force or
elastic restoring force.
Main Points of Hook’s Law
By spring force Net work done is zero.
Velocity is maximum at mean position.
Velocity is zero at extreme position.
Acceleration is zero at mean position.
Acceleration is maximum at extreme position.
When displacement is zero then acceleration is zero because a x acceleration is directly
proportional to the displacement.
When acceleration is positive +ve then displacement is negative –ve.
When acceleration of S.H.M is maximum, velocity is minimum.
For Understanding conceptually watch this video
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