Introduction to waves Tuesday, March 22, 2016

Upcoming dates: Unit 11: Waves Tuesday, 3/22 Monday, 4/4 – waves quiz. Pick up a warm-up sheet and the Spring fever article and do the following: Read the article (do not write on it) Commit to three things you will do to combat ‘spring fever’ and finish the year strong with pride. Write your commitments on your warm-up Upcoming dates: Monday, 4/4 – waves quiz. Friday, 4/8 – waves quiz Tuesday, 4/12 – Waves test and all missing waves work is due (missing work is a zero after you test) Monday, 4/18 – EM Spectrum/Optics quiz Tuesday, 4/26 - EM Spectrum/Optics quiz Thursday, 4/28 – EM Spectrum/Optics test all missing EM Spectrum/Optics work is due (missing work is a zero after you test) Friday, 5/6 – Atomic Physics test all missing Atomic physics work is due (missing work is a zero after you test) Monday, 5/16 – Rube Goldberg Project due (test grade) Friday, 5/20 – Bottle Rocket launch day (test grade) Thursday, 5/26 – Exam review due (it is 30% of your exam grade)

Where we’ve been We have explored different types of energy transfer. Discuss with your partner the different types of energy transfer we have studied during the school year.

Energy Transfer Conservation of momentum Mechanical energy transfer Thermal energy transfer Electrical potential energy transfer

Where we are going Investigate the energy transferred by mechanical waves.

Electromagnetic (EM) Waves Unit Overview Waves Mechanical Waves Electromagnetic (EM) Waves Transverse Longitudinal Light wave Ocean wave Sound wave

Tsunami As you watch the video think about the following: What causes the Tsunami? What role does energy play if any? What relevance does the velocity of the wave have on the destruction? What happens to the water after the Tsunami strikes? Tsunami Video

Let’s break it down

Generic reason: a pulse (single disturbance)

Large magnitude (speed) and direction results in a large force (F = ma) and a transfer from PE to KE.

Mechanical waves transport energy through a medium. The wave is the energy and the water is the medium through Which it is transported.

EQ: What causes wave motion? Read through your CNs Highlight, underline, or circle the words associated with how a wave is created and what a wave is. Highlight, underline, or circle the words that describe the purpose of a medium and how it functions.

EQ: What causes wave motion? Answer your EQ in the summary section (should not be more than three sentences)

EQ: What are the characteristics of the different types of waves that occur in nature? Read through your CNs Highlight or underline the words that are similar between a electromagnetic and mechanical wave. Circle the words/concepts that make electromagnetic and mechanical waves different from one another.

Types of Waves There are two types of waves Type of wave is dependent on whether it requires a medium. Mechanical waves require a medium Electromagnetic waves do not require a medium.

Electromagnetic (EM) Waves Unit Overview Does not require a medium; can travel in a vacuum Waves Requires a medium Mechanical Waves Electromagnetic (EM) Waves Transverse Longitudinal Light wave Ocean wave Sound wave

EQ: What are the characteristics of the different types of waves that occur in nature? Answer your EQ in the summary section (should not be more than three sentences)

Periodic Motion

Periodic Motion Pendulum Animation

How do particles move in a mechanical wave? As you watch the animations, pick a particle and follow it as it moves in the simulation. Particle simulation; longitudinal and transverse waves

EQ: What are the characteristics of mechanical waves? Read through your CNs Underline the words/phrases that explain how particles move. Highlight or Circle the following words; transverse, longitudinal, medium, perpendicular, parallel, crest, trough, compression, rarefaction, amplitude.

Electromagnetic (EM) Waves Unit Overview Does not require a medium; can travel in a vacuum Waves Requires a medium Mechanical Waves Electromagnetic (EM) Waves Moves Perpendicular Moves parallel = Transverse Longitudinal Light wave Ocean wave Sound wave

EQ: What are the characteristics of mechanical waves? Answer your EQ in the summary section (should not be more than three sentences)

Common Language The properties of waveforms are Wavelength Amplitude Frequency Period Velocity

What is wave length?

What is amplitude?

What is the frequency of the wave?

What is the period of the wave?

EQ: What do the properties of waveforms allow you to do? Answer your EQ in the summary section (should not be more than three sentences)

EQ: What do the properties of waveforms allow you to do? Answer your EQ in the summary section (should not be more than three sentences)

One pager Put your name (small left had corner) on the blank sheet of paper. Create a one page summary to use on a open note quiz. When you are finished, come see me and I will give you a piece of tape to hang your one pager up. After you hang your paper up wait for further instructions.

Cool Down What role does a medium play in energy transformation of a mechanical and electromagnetic wave?