2. Catch the Wave

4. TAKS Objective 4 The student will demonstrate an understanding of motion, forces, and energy.

5. TEKS 8.7 Science Concepts The student knows that there is a relationship between force and motion. The student is expected to: B. recognize that waves are generated and can travel through different media.

6. Lesson Objectives The learner will be able to differentiate between the motion of the wave and the motion of the matter carrying the wave. The learner will identify waves that require a medium to move through and waves that travel through empty space. The learner will demonstrate that waves carry energy.

7. Lesson Objectives Students will generate waves that pass through different media. The student will demonstrate that a wave moves forward while the material through which it passes is displace only slightly and momentarily. Students will measure wave properties.

8. What students will study Mechanical waves which require a medium –Longitudinal waves like sound –Transitional waves like ocean waves

9. What students will study Electromagnetic waves travel though space –Radiation from the Sun produces heat on Earth –Radio waves are captured by a receiver and transformed into mechanical waves

10. –L-o-n-g-i-t-u-d-i-n-a-l

11. Mechanical Waves Are caused by the Compression and R a r e f a c t I o n Of the molecules in the medium through which the wave is traveling. An example is:

12. Sound Waves

13. Another mechanical wave Is the transverse wave. The wave travels and the medium moves from side to side.

14. – T~r~a~n~s~v~e~r~s~e

15. Waves that travels through space are called

16. Electromagnetic Waves radio light heat radiation microwaves X-rays

17. Summary Waves carry energy from one place to another without the medium moving nearly as far. Amplitude is the size of a wave. Wavelength is the distance from one point a wave to a corresponding point on the next cycle. Period is the time it takes to make one oscillation. Frequency is how many times in a second a wave wiggles.

18. Summary Continued There are many kinds of waves. Mechanical waves are a form of motion in which one part of the object moves relative to another, rather than an overall motion of the object from one place to another. All mechanical waves need a material medium to shake. Mechanical waves can be transverse or longitudinal. The speed of a mechanical wave is determined by how stiff and how dense is the medium.

19. Summary Continued Radio, light, heat radiation, microwaves and X-rays are all electromagnetic waves that do not require any medium other than space. Seismic waves are of two types: –Longitudinal P waves –Transverse S-waves

20. Chapter Activities Are designed to provide a variety of experiences with waves. Students will generate and study waves traveling through many different types of medium including: Air Dominoes String Rubber And Jello

21. Now let’s take a look at Chapter Four.