Unit 2 Cycle 1 Activity 3

1. Unit 2 Cycle 1 Activity 3 Physical Science Mr. Singer

2. Questions • To understand the types and properties of waves, and how they transfer energy from a source to a receiver. • What are some types and properties of waves? • As the wave moves through the medium of the Slinky, each part of the Slinky pushes or pull on the next part. During these pushes and pulls, mechanical energy is transferred from one part of the Slinky to the next. Purpose What is the purpose for this activity? What is the key question? We Think 3. How does the energy get transferred from you to your friend since none of the coils you are holding onto travel all the way to your friend’s end?

3. Questions • A wave in which the motion of the material is perpendicular to the motion of the wave. • A continuous succession of pulses. • The height of a wave crest. It is related to a wave’s energy. • They feel the pulse pushing against their hand. • Energy is being transferred from one hand to the other through the Slinky. The other person felt their hand being pushed. Explore Your Ideas Define transverse wave. Define wave. Define Amplitude. What does the person on the other end feel when the pulse reaches that end? Do you think energy is being transferred from the hand generating the pulse to the hand at the other end? Why?

4. Questions • More energy because the slinky is moving more and it looks like it is taking more energy to make the larger amplitude. • No. The coils only move up and down as the pulse goes by. Explore Your Ideas Does a transverse pulse with a larger amplitude transfer more, less, or the same amount of energy than one with a smaller amplitude? In the video, the pulse moves along the Slinky from one end to the other. Do any of the coils travel along with the pulse from one end to the other?

5. Questions 1.The number of waves produced in a unit of time. 2. The distance between identical points along a wave. 3. The number of times a wave moves back and forth in one second. 4. A wave in which the motion of the material or medium is parallel to the direction of the motion of the wave. Explore Your Ideas Define frequency. Define wavelength. Define Hertz. Define compression or longitudinal wave.

6. Explore Your Ideas Continued • Draw sketches of two transverse waves, one under the other. Each should have the same amplitude, but one is generated at a higher frequency and one on a lower frequency. Label which is the lower frequency and which is the higher frequency. • As the frequency increases the wavelength DECREASES.

7. Explore Your Ideas Continued • Draw sketches of two transverse waves, one under the other. Each should have the same FREQUENCY, but one is generated at a higher AMPLITUDE. Label which has the higher amplitude and which has the lower amplitude. • Do you think the wave with the larger amplitude will transfer more or less energy?

8. Questions • Each coil changes its motion as the pulse goes through. Once the pulse has gone through, they go back to their original position. • It is the maximum distance each coil moves when the wave starts. • It is the distance between points on the slinky where the coils are the closest together. • The number of time the slinky is moved forward and backward each second. Explore Your Ideas In the movie, what does each coil do as the compression wave passes by? How is the amplitude of the longitudinal wave defined. How is the wavelength defined in the compression wave? How is the frequency of the compression wave defined?

9. Explore Your Ideas Continued • Draw sketches of two compression waves, one under the other. Draw one that has a high frequency and one that has a low frequency. Label which one has a high frequency and which one has a low frequency. • What happens to the wavelength when the frequency increases? _____________

10. Questions • The direction of the pulse. A transverse wave runs perpendicular the medium, while a compression wave runs parallel to the medium. • Each coil vibrates back and forth as the pulse of energy moves through it. • As the frequency increases the wavelength decreases. • The change in motion of the slinky and the feeling the person had at the end of the slinky. • As the amplitude increases, the amount of energy increases. Make Sense of Your Ideas What is the difference between transverse and compression waves? When a wave travels along a slinky, what does each coil do? What is the relationship between the frequency of a wave and its wavelength? What evidence have we seen that shows a wave transferring energy? What is the relationship between the amplitude of a wave and the amount of energy it transfers?

11. Summary • Give a 5 to 8 sentence summary on the characteristics of transverse and compression waves. • ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________