Day 12 in SCI110: Motion and Freefall

Spring 2005 Schedule
Last time: Exam 1
Today:
- Discussion of test
  - mean: 75%
  - standard deviation: 8.7%
- Project proposals?
- Motion and free fall
  - Chp 2: 22-31
    - time: t
    - position: x(t)
      (position is a function of time)
    - speed: d=rt
    - velocity: combination of speed and direction
    - Gravity with Tim and Moby with Tim and Moby
    - Acceleration with Tim and Moby
    - acceleration:
      - change in speed
      - change in direction (electrons spinning around a nucleus)
      - average acceleration: (final velocity - initial velocity)/(time elapsed)
      - acceleration and deceleration are both examples of acceleration!
    - net force - the sum of all forces acting on an object
    - inertia - tendency of an object to maintain its motion if the net force is zero
    - free fall - fall under the force of gravity, neglecting air resistence
      - Galileo and Aristotle
      - d=1/2*g*t²
  - Questions: p. 45/1-3,5; Group B: 2-3
- Two experiments
- Homework:
  - Chp. 2: 32-38
  - p. 45/8-12
  - Group B 10

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