1. Welcome to PHYSICS –I (PH10001)
Sir Isaac Newton
Thomas Young
Christiaan Huygens
Welcome to
PHYSICS –I (PH10001)
Werner Heisenberg
Niels Bohr
Albert Einstein

2. Course Content Oscillations – 8 lectures Waves - 8 lectures
Waves - 8 lectures
Interference - 7 lectures
Diffraction - 7 lectures
Polarisation - 4 lectures
Quantum Physics - 8 lectures
L-T-P

3. Instructor: Dr. Anushree Roy
Contact number : 83856
Availability :
Venue: Room No. C133 in main building
Time : Thursday pm
Slides other details available at:

4. Class Timings Monday: From 1.30 to 2.30 (door will close at 1.40)
Tuesday: From 3.30 to 5.30
(door will close at 3.45)

5. Marks Break-up Mid semester exam: 30 End semester exam: 50
Tutorial: 20

6. BOOKS FEYNMAN LECTURES ON PHYSICS VOL I
THE PHYSICS OF VIBRATIONS AND WAVES
by H. J. PAIN
FUNDAMENTALS OF OPTICS
by JENKINS AND WHITE
OPTICS
by EUGENE HECHT

7. 1. LECTURE NOTES & PROBLEMS BANK for PHYSICS by SARASWAT AND SASTRY
2. PHYSICS I: OSCILLATIONS AND WAVES
by BHARADWAJ AND KHASTAGIR
3. LECTURE NOTE S AND PROBLEMS BANK
by SAYAN KAR at
Audio lecture:

8. Discussion Forum

9. OSCILLATION
HARMONIC OSCILLATION

10. OSCILLATION

11. SPRING SIMPLE HARMONIC MOTION
Assumption :
spring is perfectly linear
force of pulling back
 restoring force x
HOOKE’S LAW m x m m
max
Equation of motion m x
max
k : stiffness constant

12. Second order ordinary homogenous linear differential eqn.
second order: because the highest derivative is second order.
ordinary: because the derivatives are only with respect to one variable (t).
homogeneous: because x or its derivatives appear in every term, and
linear: because x and its derivatives appear separately and linearly in each term

13. One of the solutions of the differential equation
A is a constant : Amplitude of motion
wo refers to natural motion the spring

14. Velocity :
Acceleration :

15. Oscillation!
For A=1

16. Physical significance of A
A is amplitude of motion
Time pattern of the motion is independent A

17. Physical significance of w0
Motion repeats when changes by 2p
: Phase of the motion

18. T: Time period of motion

19. Phase estimation
For black curve
For red curve

20. Shifting the beginning (origin) of the time
General solution
t1 = some constant
Form

21. w0: angular freq. (amount of phase change in 1 sec)
(w0t+f) : phase of the oscillation
f: phase shift from some defined origin of time

22. Estimating Amplitude and Phase from Initial conditions
Initial conditions to determine D and E
At t = x=x and v=v0
Hence find amplitude
and phase

23. Velocity :
Acceleration :

24. Potential energy of the spring-mass system

25. Kinetic energy of the spring-mass system

26. Total energy of the spring-mass system
Total energy = K.E + P.E

27. Simple Pendulum
Assumption :
massless unstretchable string q l g m

28. Harmonic and circular motion (only an Analogy)v
Acceleration (a)  R q X
Geometrically
x component of the displacement of a particle moving along
a circular path with uniform speed is a SHM

29. Summary Every oscillatory motion or periodic motion has a frequency
w=2pf
Unit of f : 1Hertz = 1Hz = 1 oscillation/sec =1sec-1
The period T is the time required for one complete oscillation or cycle
Displacement during SHM as a function of time
xmax: amplitude

30. xmax=A Velocity during SHM as a function of time
wxmax: velocity amplitude
xmax=A
Acceleration during SHM as a function of time
w2xmax: acceleration amplitude

31. Reference FEYNMAN LECTURES ON PHYSICS VOL I
Author : RICHARD P FEYNMAN,
IIT KGP Central Library :
Class no.  530.4