Day 20 in SCI110: Compound Motion

Spring 2006 Schedule
Last time:
- Motion:
  - What is it,
  - How does it occur, and
  - How is it characterized?
    - time
    - position
    - velocity
    - acceleration
  - freefall and gravity
- Two experiments:
  - spark timers allow us to estimate gravity
  - "frictionless" track allows us to study how motions are represented as graphs (distance versus time)
Today:
- Return Exam 2
  - Mean score: 106
  - Standard deviation: 17
  - Curve: add 6 points to your score
  - Antilles formation
  - Questions on the Exam?
- Homework:
  - Get me your Final Project topic (due today, but okay to have it by Wednesday)
  - Feel free to discuss those with me!
  - Let's have a look at some presentation posters....
  - Consider visiting the poster sessions of the Celebration of Student Creativity and Research:
    Poster Presentations, Interactive Demonstrations and Artistic Displays will be on display in Regent's Hall on April 12, 2006 between 1:00 - 3:30 pm .
- Two experiments (discussion)
- Free fall experiment:
  - Acceleration due to gravity?
    - What value of g did you get?
    - How do you get it?
    - Data:
      - set 1 (use this one)
      - set 2
      - set 3
  - SPSS
    - plot distance versus time
    - plot the square root of distance versus time
  - Why is the plot of velocity versus time linear?
- Compound motion
  - both velocity and acceleration as vectors (arrows with length and direction)
  - Recall: linear motion
    - Sample motions
  - Horizontal and vertical
  - Circular
    - Centripetal force
    - e.g. The moon in its orbit
- Newton's Laws of Motion (introduction - more next time)
  - Tim and Moby's take on them
  - First: law of inertia
  - Second: F=ma
  - Third: forces are equal and opposite
- Exercises:
  - Questions for thought: p. 49/1-3, 5, 6, 8-12
  - Group B: 1-4, 10
- Projectile Motion lab (p. 60)

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