1. Catch the Wave!

2. Activity 1: How do waves travel?
Point of disturbance

3. Activity 1: Floating Duck
DUCKS MOVEMENT
WAVES MOVEMENT
WAVES MOVEMENT

4. Activity 4: Cannonball

5. Activity 4: Cannonball
The middle marbles do not move, the flicked marble and the last marbles move.
The first marble transferred energy to each of the other marbles. The last marble had no opposing force to stop its motion.

6. What is happening? SOLID: MARBLES!
Energy is transferred from the 1st marble through the other marbles to the last one. What is the medium this energy is traveling through?
You saw that energy travels, the marbles do not!
How is this similar to a wave moving through the water?
SOLID: MARBLES!

7. Do the water molecules travel across the bin with the wave or do they stay in one place like the duck?
The water molecules do not travel across the bin. A disturbance vibrates one molecule and that molecule disturbs another, and the energy is transferred.

8. WHAT IS A WAVE?
A wave is a disturbance that transfers energy from place to place.

9. WHAT IS A MEDIUM? WATER Any material through which a wave can travel.
What was the medium in activity 1?
WATER

10. WHAT MATERIALS CAN ACT AS MEDIUMS?
SOLID
LIQUID
GAS
A medium can be anything that has:
__________
MASS

11. WHAT KINDS OF WAVES REQUIRE A MEDIUM?
A mechanical wave is a disturbance that travels through the medium of the wave.
A mechanical wave requires a medium.

12. WHAT CREATES WAVES?
Waves are created when a source of energy causes a medium to vibrate.

13. ENERGY MEDIUM MEDIUM DISTURBANCE WAVE WAVE
EXAMPLE: A boat propeller
A moving object has
______________
A spinning propeller has energy
ENERGY
A moving object transfers energy to a
______________ when a disturbance is created.
The propeller hits the
_____________ causing a
_______________. This transfers energy from the propeller to the water.
MEDIUM
MEDIUM
DISTURBANCE A
______________
is created
WAVE
The propeller produces a ____________ that travels through the water.
WAVE

14. BACK TO THE ACTIVITY… YOU! TAPPING THE PENCIL!
What caused the disturbance that formed the waves in the bin?
YOU!
TAPPING THE PENCIL!

15. WHAT DIRECTION DID THE WAVES TRAVEL?
The waves traveled in all directions from the point of disturbance.

16. WHY DID THE DUCK JUST BOB UP AND DOWN AND NOT TRAVEL ACROSS THE BIN?
The energy was transferred from molecule to molecule.
So the wave, or energy, travels through the medium. The wave does not carry the medium.

17. WAVES TRANSFER ENERGY THROUGH THE WATER.
WAVES TRAVEL THROUGH THE WATER, BUT
THEY DO NOT CARRY WATER WITH THEM.
WAVES TRANSFER ENERGY
THROUGH THE WATER.

18. TYPES OF WAVES MOVE Waves are categorized by how they
THREE TYPES OF WAVES:
MOVE
TRANSVERSE
LONGITUDINAL
SURFACE

19. TRANSVERSE WAVES
DIRECTION OF MOTION

20. GUIDED READING… Transverse waves move the medium at
to the direction in which the waves are traveling.
Transverse means
Transverse waves move in direction.
High parts of the wave are called
Low parts of the wave are called
RIGHT ANGLES
ACROSS
ONE
CRESTS
TROUGHS

21. Label these parts on (crest and trough) your slinky diagrams from Activity 2.
CRESTS
TROUGH
DIRECTION OF MOTION

22. Longitudinal Waves (Compression Waves)
DIRECTION OF MOTION
DIRECTION OF MOTION

23. Longitudinal Waves (Compression Waves)
The energy travels through the slinky.
Compression:
The part of a
longitudinal wave
where the
particles of the
medium are close
together
Rarefaction:
The part of a
longitudinal wave
where the
particles of the
medium are far
apart

24. GUIDED READING…
Longitudinal waves move the particles in a medium ______________________ to the direction the wave is traveling.
Parts of a longitudinal wave that are close together are called ________________________.
Parts where the coils are spread out are called __________________________.
PARALLEL
COMPRESSIONS
RAREFACTIONS

25. BACK TO ACTIVITY 3
COMPRESSION
RAREFACTION

26. SURFACE WAVES Surface waves are a combination of and
When do these waves occur?
TRANSVERSE
LONGITUDINAL
THESE WAVES OCCUR WHEN A WAVE CHANGES MEDIUMS.

27. Surface Wave

28. Gnarly

29. WAVE PEAK: PROPERTIES OF WAVES
AMPLITUDE (HEIGHT)
WAVELENGTH (DISTANCE)
FREQUENCY (HOW OFTEN)
TIME

30. AMPLITUDE & WAVELENGTH
Low
Medium
High
WAVELENGTH

31. WAVE PROPERTIES 1. CREST 3. WAVELENGTH 2. AMPLITUDE 4. TROUGH 1 3 2 4
TRANSVERSE WAVE 1 3 2 4
1. CREST
3. WAVELENGTH
2. AMPLITUDE
4. TROUGH

32. FREQUENCY
To increase the frequency of a wave, the wave needs to occur more often in a certain amount of time.

33. FREQUENCY CALCULATIONS
Frequency = Speed ÷ Wavelength
F = _____________ ÷ _______________
Frequency = _________________ Hz
6 m/s
2 m 3

34. 5mm 2 Hz 10 FREQUENCY CALCULATIONS S = _____________ X _______________
Speed = Wavelength X Frequency
S = _____________ X _______________
Speed = _________________ mm/s
5mm
2 Hz 10

35. FREQUENCY CALCULATIONS
Frequency = Speed ÷ Wavelength
F = _____________ ÷ _______________
Frequency = _________________ Hz
50 cm/s
10 cm 5

36. 3 m 6 Hz 18 FREQUENCY CALCULATIONS S = _____________ X _______________
Speed = Wavelength X Frequency
S = _____________ X _______________
Speed = _________________ mm/s
3 m
6 Hz 18

37. DRAWING WAVES… A B

38. DRAWING WAVES… A B

39. DRAWING WAVES… B A

40. WAVE PROPERTIES d. B-G 1. Which distance is exactly 1 wavelength?F G H I J
1. Which distance is exactly 1 wavelength?
a. A-J b. A-D c. D-F d. B-G e. D-J
d. B-G

41. B-G, E-I, A-F, F-J, D-H WAVE PROPERTIESC D E F G H I J
2. List as many other letter combinations as you can find that also represent 1 wavelength.
B-G, E-I, A-F, F-J, D-H

42. WAVE PROPERTIES D. 8 boxesC D E F G H I J
How many units (boxes) measure one wavelength?
a b c. 6 d e. 10
D. 8 boxes

43. a. B- C b. 2 A B C D E F G H I J 4. Which distance is the amplitude?
a. B-C b. A-D c. E-G d. E-I e. A-J
5. How many units (boxes) measure the amplitude?
a. 1 b. 2 c. 3 d. 4 e. 5
b. 2

44. d. B, G b. E, I Which letters are the crests?F G H I J
d. B, G
Which letters are the crests?
A,D b. E,I c. H,J d. B, G e. F,H
7. Which letters are the troughs?
a. A,D b. E,I c. H,J d. B, G e. F,H
b. E, I

45. A B C D E F G H I J
Resting point
Crest
Trough
Wavelength
Amplitude

46. WAVE INTERACTIONS

47. WAVE INTERACTIONS
Reflection is when an object or wave hits a surface through which it cannot pass and bounces back.

48. 1. SURFACE WAVE INTERACTIONS
THE LAW OF REFLECTION STATES THAT THE ANGLE OF INCIDENCE EQUALS THE ANGLE OF REFLECTION.
2. INCOMING WAVE 3. 2.
3. REFLECTED WAVE 4. 5.
4. ANGLE OF INCIDENCE 1.
5. ANGLE OF REFLECTION

49. CHANGES SPEED AND CHANGES DIRECTION
ACTIVITY 7: PEARL
What happens to the marble as it hits the water?
What happens to a wave as it travels from one medium to another?
Why do waves bend as they enter a new medium?
The bending of waves due to a change in speed is called
SLOWS DOWN
CHANGES SPEED AND CHANGES DIRECTION
SPEED
REFRACTION

50. ACTIVITY 8: CAUGHT INSIDE

51. BENDS AND THEN SPREAD OUT
GUIDED READING…
What is happening to waves as they pass though a narrow entrance to a harbor?
When a wave passes through a barrier or moves through a hole in a barrier it
The bending of waves around the edge of a barrier is known as
WAVES ENTER IN AND THEN SPREAD OUT
BENDS AND THEN SPREAD OUT
DIFFRACTION

52. CONSTRUCTIVE WAVE INTERFERENCE+
interference occurs when waves combine and create a new wave with a larger amplitude and with larger energy.

53. WAVE INTERFERENCE
DESTRUCTIVE +
interference occurs when 2 waves combine to make a wave with a smaller amplitude.

54. VOCAB
Wave: disturbance that transfers energy from place to place
Amplitude: energy of a wave
Wavelength: distance between two parts of a wave
Frequency: rate, #/time

55. Reflection: Bounces Back
Refraction: Change Medium = Change Speed
Diffraction: Bending Barrier
Constructive Interference: Building Bigger Waves
Destructive Interference: Butts heads …no or little waves