Post on 15-Jan-2016
description
Mr. Z’s “Waves” Unit
Mr. Z about to catch some “Air”
Mr. Z’s “Riding One Home!”
Identify the features of a wave
AIM: What are features of waves?
Amplitude, frequency, hertz, wavelength, wave
speed
AIM: What are features of waves?
What is a wave?
An energy disturbance traveling place to place
What are the two types of waves we are studying
Transverse and longitudinal
,
AIM: What are features of waves?
The two types of mechanical waves:
Transverse
Longitudinal
AIM: What are features of waves?
TRANSVERSE WAVES
EXAMPLE: “waves made with the rope”
EXAMPLE: “water waves”
AIM: What are features of waves?
TRANSVERSE WAVES
The particles of the medium typically move perpendicular to the movement of the wave!
AIM: What are features of waves?
TRANSVERSE WAVES
The particles of the medium typically move perpendicular to the movement of the wave!
AIM: What are features of waves?
LONGITUDINAL WAVES
The particles of the medium typically move parallel to the movement of the wave!
AIM: What are features of waves?
Draw a transverse wave on the board
Identify CRESTS and TROUGHS
15-1 Transparency 57: Transverse Wave
AIM: What are features of waves?
Draw and label crest and trough .
AIM: What are features of waves?
Draw and label the crest and trough
AIM: What are features of waves?
The highest point of the wave?
the crest.
lowest point is called ?
the trough.
AIM: What are features of waves?
Waves can be characterized in terms of three basic features
1. Amplitude
2. Wavelength
3. Frequency
AIM: What are features of waves?
Height of the wave. Distance between the the crest and the “normal” position
AIM: What are features of waves?
Draw three waves:
The first will have a 1 cm amplitude, the second will have a 2 cm amplitude, and the third will have an amplitude of 3 cm.
AIM: What are features of waves?
Draw and label the crest and trough and amplitude..
AIM: What are features of waves?
Draw and label the crest and trough and amplitude..
AIM: What are features of waves?
Amplitude
Draw and label the crest and trough and amplitude..
AIM: What are features of waves?
Amplitude
Draw and label the crest and trough and amplitude..
AIM: What are features of waves?
Amplitude
Are all the Amplitudes on the same wave identical?
YES THEY HAVE TO BE!
AIM: What are features of waves?
Amplitude
AIM: What are features of waves?
wavelength
The distance between the crest of one wave and the crest of the next wave.
AIM: What are features of waves?
The distance between the trough of one wave and the trough of the next wave.
How else could you define wavelength?
AIM: What are features of waves?
Draw and label the wavelength, crest and trough.
AIM: What are features of waves?
Draw and label the wavelength, crest and trough
AIM: What are features of waves?
wavelength
Draw and label the wavelength, crest and trough
AIM: What are features of waves?
wavelength
Are both wavelengths the same ?
Yes!
All wavelengths on the same wave are the same length
wavelength
AIM: What are features of waves?
Crest
Trough
AIM: What are features of waves?
Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave
Crest
Trough
AIM: What are features of waves?
Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave
Crest
Trough
Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave
Crest
Trough
Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave
Crest
Trough
Label the Crest, Trough, Amplitude, rest position, & wavelength of this transverse wave
AIM: What are features of waves?
AIM: What are features of waves?
QUICK REVIEW: Longitudinal Wave
Where are the compressions ?
QUICK REVIEW of Longitudinal Wave
Where are the rarefactions ?
What is the wavelength of this Longitudinal Wave?
The number of “compete wave cycles” that pass a certain point in a given amount of time.
Usually measured in the number of complete waves per second
AIM: What are features of waves?
Don’t confuse wavelength with a complete wave cycle !!!!!!!
Definition: The number of complete wave cycles that pass a given point in one second is the wave's frequency.
“What is a complete wave cycle?”
A complete wave cycle is measured as
“from one crest (or trough) to the next” AND
Crest
Crest
How many of those cycles pass by in a one second interval of time
Frequency is measured in “HERTZ”
Definition of Hertz:
•unit used to measure the frequency of a wave
•a measure of the number of complete waves per second
•What does 15,000 hertz mean?
All waves move at a specific speed.
The speed of a wave =
(frequency) x (wavelength)
AIM: What are features of waves?
The speed of wave measures how many meters it travels per
second
The hertz (frequency) of a wave measure how many waves (or crests) there are each second
http://id.mind.net/~zona/mstm/physics/waves/partsOfAWave/waveParts.htm#frequency
REVIEW
REVIEW
Class Activity:
W/S Concepts 7-3
PH 15-2
AIM: What are features of waves?
Homework:
INTERNET QUESTIONS
AIM: What are features of waves?