Lesson ppt for grade 8 regarding transverse and longitudinal waves

Transverse

1. Title : Transfer of energy through Waves Lesson objectives Must be able to understand how the wave transfer energy and how the waves are classified in terms of medium. Lesson goals I can define and differentiate between transverse and longitudinal waves ? I can name those waves which is required/not required medium to travel ? I can demonstrate transverse and longitudinal waves and compare compression and rarefaction. Starter : Watch a short video then answers the questions given at the end . Read a short paragraph then a nswers the questions given. Scaffolder practice ( You do ) Students will demonstrate waves using slinky spring then they will write the answers of the questions as a group task. I will move around and will be monitoring the task, helping them and correcting their answers. Instruction and Modelling (I do/We do) Short review about transverse , longitudinal , Mechanical and electromagnetic waves. Demonstrate these waves using slinky spring and deliver some knowledge about compression and rarefaction. Lesson Plan Vocabulary ; Transverse/longitudinal Waves , Mechanical and electromagnetic waves , compression and rarefaction Checking for understanding Assessment Worksheet will be given to check the understanding of the students group wise. Students will move around at the end to discuss their answers with peers Plenary Exit Ticket ..Students will answer the questions and must have to write summary at the end..Self mark Extension Task Short quiz will be taken individually while making students to sit in rows and will be marked next day to save the result as a record.

2. Title : Transfer of energy in waves What are we learning today… Zeeshan Abid Lesson objectives: Understand how Transverse and longitudinal waves transfer energy in terms of compression and rarefaction. Identify and differentiate between Transverse and Longitudinal waves. Conduct simple experiments to observe and understand the difference between these two waves. Discussion about mechanical and electromagnetic waves.

3. Transfer of energy in Waves Learning Goals Scientific vocabulary I can define transverse and longitudinal waves . I can define mechanical and electromagnetic waves Transverse and Longitudinal Waves, Mechanical and Electromagnetic waves, Compression and Rarefaction I can differentiate between transverse and longitudinal waves I can differentiate between mechanical and electromagnetic waves . I can explain by using a slinky spring to describe the motion of particles and direction of wave

4. Transverse and Longitudinal waves: Watch the video then answer the questions given in the next slide . Starter

5. Transverse and Longitudinal waves 1.How the waves are produced ? 2.How will you define longitudinal and transverse waves while including a t least one example ? 3.Can you please mention the direction of wave energy and particles in both cases ? Starter Questions 5 Minutes

6. 1.How the waves are produced ? Ans.1. Due to the vibrations in a medium . 2.How will you define longitudinal and transverse waves while including a t least one example ? Ans.2. The waves where particles vibrate Parallel to the direction of waves are called longitudinal waves.e.g (Sound waves) The waves where particles vibrate Perpendicular to the direction of waves are called Transverse waves.e.g (Water) 3.Can you please mention the direction of wave energy and particles in both cases ? Ans.3. In longitudinal waves,Direction of wave is parallel to the particles. In transverse waves,Direction of wave is perpendicular to the particles Starter Questions Correct Your Mistakes.

7. Transverse and Longitudinal waves Read a short paragraph and answer the questions given at the end: Introduce (I Do)

8. Transverse and Longitudinal waves Read a short paragraph and answer the questions given at the end: Longitudinal wave is a type of wave where particles vibrate parallel to the direction of waves but in Transverse waves particles vibrates at 90 degrees/perpendicular to the direction of waves. Compression is a part of longitudinal waves where particles are closed together and in Rarefaction particles stay far apart. The wave speed always depends on the medium through which the wave is passing. A Longitudinal and a transverse wave can combine to form a Surface wave. Ripples on a pond is an example of surface wave. Introduce (I Do) 3 Minutes

9. Transverse and Longitudinal waves Hint to answer the questions Introduce (I Do)

10. Transverse and Longitudinal waves Hint to answer the questions Introduce (I Do)

11. Transverse and Longitudinal waves Read a short paragraph and answer the questions given at the end: 1.What is the similarity between transverse and longitudinal waves? 2.Compare the compression and Rarefaction in longitudinal wave ? 3.In which medium waves move fastest and why ? A. Solid B. Liquid C. Gas Apply (You Do) 5 Minutes

12. 1.What is the similarity between transverse and longitudinal waves ? Ans.1. Both waves transfer energy. 2.Compare the compression and Rarefaction in longitudinal wave ? Ans.2. The area where particles are closed together is called compression. The area where particles are far apart is called rarefaction 3.In which medium waves move fastest and why ? A. Solid B. Liquid C. Gas Ans.3. Solid(Because particles are closed together) Apply (You Do) 5 Minutes Correct Your Mistakes.

13. The Essential Questions 1 Minute

14. Apply (You Do) 2 Minutes

15. Apply (You Do) Correct Your Mistakes.

16. Build (we Do)

17. Build (we Do)

18. How do waves transfer energy? Earthquakes send out both types of waves. Primary waves, called P waves, are longitudinal waves. They always arrive first. Secondary waves, called S waves, are transverse waves. They always arrive second. They can combine to form a surface wave, like ripples on a pond. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 1 Lesson 1 Waves Introduce (I Do) 2 Minutes

19. TRANVERSE WAVES Sideways or up & down Examples: S-type earthquake waves Electromagnetic (EM) or light waves Vibration is perpendicular to the direction of the motion of the wave              Introduce (I Do) 2 Minutes

20. S waves are more dangerous than P waves because they have greater amplitude and produce vertical and horizontal motion of the ground surface. The slowest waves, surface waves, arrive last. They travel only along the surface of the Ear Introduce (I Do)

21. Discuss (we Do) 7 Minutes

22. Discuss (we Do) 7 Minutes

23. Discuss (we Do)

24. Identify the type of waves as transverse or longitudinal: (A- Transverse B – longitudinal C –Both D- none) ___________ Ripples in the surface of the water ___________ Sound ___________ P Earthquake waves ___________ S Earthquake waves ___________ waves on a string ___________ Radio waves ___________ UV waves ___________ Ocean waves Check for understanding 3 Minutes

25. Identify the type of waves as transverse or longitudinal: (A- Transverse B – longitudinal C –Both D- none) _____ C ______ Ripples o n the surface of the water _____ B ______ Sound _____ B _____ P Earthquake waves _____ A _____ S Earthquake waves _____ A _____ waves on a string _____ A _____ Radio waves _____ A _____ UV waves _____ A ______ Ocean waves Check for understanding Match Your Answers

26. Wave Name: Example: Wave Name: Example: Transverse Longitudina l Compression Crest Trough Water Rarefaction Sound Peer Asessment Draw and Label 3 Minutes

27. Wave Name: Example: Wave Name: Example: Transverse Longitudina l Compression Crest Trough Water Rarefaction Sound Peer Asessment Match Your Answers.

28. Mechanical and Electromagnetic waves: Watch the video then answer the questions given in the next slide . Discuss (you Do)

29. 1.What is the difference between mechanical and electromagnetic waves ? 2.Give at least two examples of mechanical and electromagnetic waves ? 3.Why sound cannot travel in vacuum? Mechanical and Electromagnetic waves: 5 Minutes Apply (You Do)

30. 1.What is the difference between Mechanical and Electromagnetic waves ? Ans.1.The wave which requires medium to travel is called Mechanical waves. The wave which doesn’t require a medium to travel is called Electromagnetic waves 2.Give at least two examples of Mechanical and Electromagnetic waves ? Ans.2. Mechanical waves : Sound and Water Electromagnetic waves : Visible light and Radio waves 3.Why sound cannot travel in vacuum ? Ans.3 Because there is no medium(Air) 5 Minutes Apply (You Do) Correct Your Mistakes.

31. Assessment Draw a poster about a situation in which a wave is involved. Indicate and label the wave featured on your poster and explain whether the wave is mechanical or electromagnetic. (2 points) 5 Minutes

32. Exit Ticket : Question Write a short summary of today’s Lesson with at least 40 words ? Exit Ticket Self/Peer Mark with Red P ens