Bullying Essay

882 words - 4 pages

Part A: Vibrations produce sound1.Prepare all the materials needed for the activity. Make sure that you find a workarea far enough from other groups.2.Put the plastic tightly over the open end of the large can and hold itwhile yourpartner puts the rubber band over it.723.Sprinkle some rock salt on top of the plastic.4.Hold the small can close to the salt and tapthe side of the small can with the rulerasshown in Figure4.Q1.What happens tothe salt?5.Try tapping the small can in different spots or holding it in different directions.Find out howyoushould hold and tap the can to get the salt to move anddance the most.Q2.How were you able to make the salt move and dance the most?Q3.What wasproduced when you tapped the small can? Did you observe the saltbounce or dance on top of the plastic while you tappedthe small can?Q4.What made the salt bounce up and down?Q5.From your observations, how would you define sound?6.Switch on the transistorradio and position the speaker near the large can.Observe the rock salt.7.Increase the volume of the radio while it is still positioned near the large can.Observe the rock salt again.Q6.What happened to the rock salt as the loudness is increased?Q7.Whichwave characteristic is affected by the loudness or the intensity of sound?Part B: Transmitting sound8.Let 2 books stand up as shown in Figure5. Place the dowel on top of the 2books.Figure473Figure5.Setup for Activity 1B9.Cut out an image ofahuman ear fromamagazine and tape it to one of thebooks.10.Start with the blue bead. Tape the string to the mark on the dowel that isfarthest away from the ear.11.Then tape the 4 colored beads to the other 4 marks. Make sure that all thebeads hang in a straight line.12.The colored beads represent airparticles. Create vibrations (sound) in the airby tapping the blue bead toward the colored beads.Q8.What happens to the other colored beads when the blue bead is tapped?13.Create more vibrations by continuously tapping the blue bead and observethe other beads.Q9.Are there occasion when the beads converge then expand?14.If the beads represent airparticles, what do the converging and expanding ofthe beads represent?15.Connect one endof the slinkyto a fixed point. Hold the other end then pushand pull the slinky continuously. Record your observations.Q10.Are there converging and expanding parts of the slinky?Q11.How then is sound classified as a wave?16.This time shake the other end of the slinky while the other end is stillconnected to the fixed point. Record your observations.Tape earphoto here74Wereyou able to get good sets of data from the activity? Did you enjoywatching the salt dance and the beads move? The salt and the beads representparticlesof air when disturbed. The disturbance encountered by the salt and thebeads causes the salt to bounce up and down and the beads to move together andspread alternately. In grade 7, you discussed that energy is transferred ortransmitted from one object to another. Bouncing...

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