DAY 79

WARM-UP:

1. You'll be measuring the initial (close) and final (far) sides of each fringe. Why not just measure the middle of the fringe?

2. How do we find the average distance of each fringe from the central point?

CLASSWORK:

#078B continued: "How Wide is your Hair?" Lab

LINK Read (skip #11). Also note that to save time, steps 1-4 will be different, as we will be mounting the hair directly to the front of the laser.

• Copy the data table from pg 7 into your notebook
• Materials: Ruler, strand of hair, tape, piece of paper, laser
• Discuss safety:

1. List three safety concerns:
2. To collect data, you'll need the laser on for an extended period of time. Should you tape the power button on? Why/Why not?
3. Lasers are fragile. Describe how you can handle them to keep them functioning.

• Practice time:
  • For successful data collection, you'll need to...
    • ...mount the hair to the front of the laser. We will practice that.
    • ...move your table or chair so that the distance between the hair and the target (paper on the wall) is less than or equal to one meter. We will practice that as well.
    • If you can get both of the above correct, I'll initial your data chart, and you'll be ready to begin the data collection portion of the lab.
• Data Analysis.
  • You'll be measuring the initial (close) and final (far) sides of each fringe. Why not just measure the middle of the fringe?
    • How do we find the average distance of each fringe from the central point?

Today we will collect data, and analyze the data you collect

HOMEWORK

Labs Due Friday

Tomorrow we will start our unit on Electricity - there will be a video and questions here by the end of the school day, due tomorrow.

Static Electricity: Watch the video here: https://ed.ted.com/lessons/the-science-of-static-electricity-anuradha-bhagwat#watch

While watching, on your own sheet of paper, answer the 7 "Think" questions listed in the Think section of the website (you can also click here (LINK) for the questions