] I " HTips for Teachers Wave on a String The Wave on a String simulation allows students to create their own waves and explore wave concepts such as amplitude, frequency, damping, tension, speed, reflection, and interference. CREATE a wave with an oscillator or pulse generator, or by moving a wrench CONTROL wave properties RESTART the wave while preserving the other settings in the sim VIEW the wave in slow motion Rouinfar, _fl:f'\\ 216 it Hastart &) Osci g0, \"\"\" --- -"a' o' - a a * Mg' . L | e S '\\ / - rma Restart Wave on a String Pulse Width 0.40 & 3 > PLACE reference line anywhere MEASURE distance or time EXPLORE waves with a fixed, loose, or no end point PAUSE and step through the motion of the wave Waves on a String Objective: 1. Discuss waves' properties using common vocabulary. 2. Predict the behavior of waves through varying mediums and at reflective endpoints. 3. Use scientific vocabulary for wave properties and behavior. Explain your understanding: 1. Write a list of characteristics to describe the waves. Describe each characteristic in your own words so that any person could understand waves, Use images to help with the descriptions. Tips: Later during this lab, you will relate your own descriptions to scientific ones. Itis important that you have your own words to begin your learning, so don't do any research yet. Also, learning is best when you make your own drawings, Perhaps you can insert images of your own drawings. if not then use images from Waves on a String that look like your drawings. Wave Characteristics: a b, etc. Expand your understanding: L Mana 18) O vitate () Fad B 1) Lmae Bl For steps 2-5 Investigate waves with Oscillate | | and No End * 0 Fuers tae Wt ' - L Cie Tips: Helpful tools " J and Oewnaire 2. Use the Amplitude slider. Answer the questions; include images a. Define Amplitude in everyday language. b. Explain how the wave behaves as the Amplitude changes using the characteristics you described in #1 3. Use the Frequency slider. Answer the questions; include images. a. Define Frequency in everyday language. b. Explain how the wave behaves as the Frequency changes using the characteristics you described in #1 4. Use the Tension slider. Answer the questions; include images. a. Define Tension in everyday language. b. Explain how the wave behaves as the Tension changes using the characteristics you described in #1 5. Use the Damping slider. Answer the guestions; include images. a. Define Damping in everyday language. b. Explain how the wave behaves as the Damping changes using the characteristics you described in #1 6. Hold the end of a real rope or the corner of a blanket. Shake to make several waves. a. How can you change the Amplitude of the wave? b. How can you change the Frequency of the wave? C. Did you make waves more like Manual, Oscillate or Pulse? |OF.k. d. Use the simulation to show how your real experiment would look for changing Amplitude. (Explain your experiment and insert images here) e. Use the simulation to show how your real experiment would look for changing Frequency . (Explain your experiment and insert images here) Practice applying your understanding: 7. A wave was generated by Oscillation and paused at two different times. 00:00.00 5 D 00:00.20 Describe differences and similarities in the characteristics of the wave at different times.Investigate for understanding: 8. Make a wave with the Oscillator with no Damping a. b. Measure the vertical and horizontal location of algreen ball| (you can pick any green ball you want) with the ruler and record the time. | Use !) to collect data to make a data table of the time, vertical and horizontal pasitions of the same green ball, Make sure to include observations when the green ball is above and below the middle line. 2 | e ke | - Qe W @) |, 8 g vertical horizontal time {em) {cm) Make graphs of vertical position versus time and harizontal position versus time, Describe or include images of each graph. How do the graphs help you understand the characteristics of waves? Predict how the graphs will look if you increase the damping. Test your ideas and explain why damping affects the graphs. 9. Investigate how waves behave with other settings: Fixed, Loose, Monual, Pulse_ Write a summary of your observations including images for evidence. Test your understanding: The figure below shows a rope on a smooth floor with a knot at point A. Someone has shaken the end sideways to make a pulse. You are looking down and taking a movie of the motion. Below is one freeze frame of the movie, Underline your answer for each situation: 1 If you advance the movie one frame, the knot at point A would be a} In the same place b) higher ] lower d)totheright &) to the left If the person generates a new pulse like the first but more quickly, the pulse would be a) same size b) wider ) narrower If the person generates another pulse like the first but he moves his hand further, the pulse would be a) same size b) taller ) shorter If the persan generates another pulse like the first but the rope is tightened, the pulse will move a} at the same rate by faster ) slower Now the person moves his hand back and forth several times to produce several waves. You freeze the movie and get this snapshot. Underline your answer for each situation: 5. 6. 7. If you advance the movie one frame, the knat at point A would be a) in the same place b) higher c) lower djtothe right ) to the left If you advance the movie one frame, the pattern of the waves will be refative to the hand. a) inthe same place b) shifted right c) shifted left d) shifted up #) shifted down If the person starts over and moves his hand more quickly, the peaks of the waves will be a) the same distance apart b) further apart ) closer together If you lower the frequency of a wave on a string you will a) lowerits speed. b) increase its wavelength. c). lower its amplitude. d) shorten its period. 9, Consider this wave approaching a fixed end Which shows the wave after it reflects? Bl N