teacher`s guide
Contents
1. which is like internal resistance Some students may want to understand more and could use Masses and Springs Damping 1s called Friction in this sim or Resonance sim the Tips give a mathematical definition e This sim may be helpful for students as an introduction to more difficult concepts like sound earthquakes or light Suggestions for sim use e For tips on using PhET sims with your students see Guidelines for Inquiry Contributions and Using PhET Sims e The simulations have been used successfully with homework lectures in class activities or lab activities Use them for introduction to concepts learning new concepts reinforcement of concepts as visual aids for interactive demonstrations or with in class clicker questions To read more see Teaching Physics using PhET Simulations e For activities and lesson plans written by the PhET team and other teachers see Teacher Ideas amp Activities e Gold Star Activities Middle school Anatomy of a Wave by Jackie Esler High School Waves on a String Inquiry Based by Trish Loeblein Undergrad EM Wave Analogy by Noah Podolefsky Authors Loeblein Adams last updated August 20112. PhET Tips for Teachers Waves on a String Tips for controls e To Reset All refresh your browser Reset only restarts the Oscillator and wave string to a zero position e Pulse is very helpful to focus particularly on what happens to a wave as it travels in the medium and during reflection Using Low Tension with pulse slows the motion so makes for good demonstrations Pressing Pulse a second time allows for analysis of superposition e You can Pause the sim and then set the parameters In a demonstration it would provide easy opportunity to ask What 1f e In most browsers F11 will maximize the window F11 is a toggle so use it again to get back the tool bars e The rulers and other tools are draggable to allow interesting investigation Select Show Help to get ideas e To demonstrate a standing wave set the Amplitude to 3 and the Frequency to 25 This will create a slightly imperfect standing wave Important modeling simplifications e The simulation is like a rope on the ground with transverse waves being propagated side to side with no gravitational effects or external friction e The string is modeled by using particles and can look like the string has dissociated if extreme conditions are set because the processing increments are not infinitely small Paused Insights into student use thinking e Students are very engaged and learn from the sim with little guidance e Some students struggle with Damping
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