Bell Work
NEW SEATING CHART Coulomb's Law Practice Problems: 1) Two particles have charges equal to -35.0 μC and +50.0 nC, and are separated by a distance of 0.03 m What is the magnitude of the force between the particles, and is the force attractive or repulsive? 2) Two particles have charges equal to -73 μC and -124 nC, and are separated by a distance of 3 μm What is the magnitude of the force between the particles, and is the force attractive or repulsive? 3) Two particles have charges q1 and q2 , and q1 = 790 nC. The distance between the particles is 27 cm, and the attractive force between them is 0.2 N. What is q2 (polarity and charge of particle?) Answers: 1) 17.5 N Attract, 2) 9.052x10^9 N Repelling 3) -2.05x10^-6 C or -2.05μC Lesson 1. Discussion about Types of experiments with the inverse square law. 2. Take Scientific Investigation QUIZ 3. Discussion about the Inverse Square Law Lab 4. Work on inverse square lab. Homework Organize and conduct an experiment on the inverse square law.
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"Don't take a slacker senior year just because it's your last year. Get the most college credits you can in high school because it will really pay off in college! You will be able to save lots money, time, and stress!! Also explore your job options and go to a job shadow to see what you might like or dislike. Don't be afraid to just go to UW-Sheboygan your first year of college if you don't know what you want to do. It will save you lots of money and you're still getting the same classes you would be at a different school." Aimee Bichler - Class of 2017 The Goal For Today Learn about how to test Coulomb's Law and the Inverse Square Law in an experiment. Notes
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Intervention for the Week
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A few junior girls decide to conduct experiment studying the inverse square law. They hypothesis that the results they gather in the experiment should follow a similar pattern. In doing this, one of the students tests light intensity, a second studies sound intensity, and the 3rd explores the thickness of "I cannot believe it's not Butter" spray on toast.
Experiment 1: Student one has the initials MB and tests the inverse square law with a pink flood light. In her experiment, she sets up the flood light in her driveway and points it down the block toward the East. She then marks off 8 different testing distances away from the light and marks them with chalk. The distances are 10m, 20m, 30m, 40m, 50m, 60m, 70m and 80m. Using a logger pro and light intensity meter, she measures the intensity of light in LUX. This information was recorded in data table 1.
Experiment 2: This student has the initials AS and in order to study sound, she took a bluetooth speaker and placed it on the railroad tracks. She then marked off the distances of 20 m, 40m, 60m, 80m, and 100m. During the experiment she played a B# at a constant volume through the Bluetooth speaker and used a Verneer ULI microphone to record the sound intensity at each distance. The units she measured sound in was in decibels and was recorded in Table 1.
Experiment 3: This student has the initials EF and in experimenting how "I cannot believe it's not Butter" spray follows the inverse square law, she took a piece of tag board over to the tennis courts and marked out 6 distances beyond the control test: .1 meter, .2 meters, .3 meters, .4 meters , .5 meters, and .6 meters. She then sprayed one pump of "I cannot believe it's not Butter" at the tag board from each distance. To get the mass of butter in a given area, she cut out a 10 cm x 10 cm square out of the center of each piece of tag board and weighed it on a sensitive postal scale. She then compared each sample to 10 cm x 10 cm square that had not been sprayed with butter. The units she measured the butter in was in grams and was recorded in Table 1.
Experiment 1: Student one has the initials MB and tests the inverse square law with a pink flood light. In her experiment, she sets up the flood light in her driveway and points it down the block toward the East. She then marks off 8 different testing distances away from the light and marks them with chalk. The distances are 10m, 20m, 30m, 40m, 50m, 60m, 70m and 80m. Using a logger pro and light intensity meter, she measures the intensity of light in LUX. This information was recorded in data table 1.
Experiment 2: This student has the initials AS and in order to study sound, she took a bluetooth speaker and placed it on the railroad tracks. She then marked off the distances of 20 m, 40m, 60m, 80m, and 100m. During the experiment she played a B# at a constant volume through the Bluetooth speaker and used a Verneer ULI microphone to record the sound intensity at each distance. The units she measured sound in was in decibels and was recorded in Table 1.
Experiment 3: This student has the initials EF and in experimenting how "I cannot believe it's not Butter" spray follows the inverse square law, she took a piece of tag board over to the tennis courts and marked out 6 distances beyond the control test: .1 meter, .2 meters, .3 meters, .4 meters , .5 meters, and .6 meters. She then sprayed one pump of "I cannot believe it's not Butter" at the tag board from each distance. To get the mass of butter in a given area, she cut out a 10 cm x 10 cm square out of the center of each piece of tag board and weighed it on a sensitive postal scale. She then compared each sample to 10 cm x 10 cm square that had not been sprayed with butter. The units she measured the butter in was in grams and was recorded in Table 1.