Day 19 in SCI110: Motion and Freefall
- Spring 2006 Schedule
- Last time:
- Debate partners and projects chosen (due April 5th)
- Exam 2
- Today:
- Sorry, I don't have the exams graded yet.
- Homework:
- Chp. 2: 34-41
- QFT 5, 6, 8, 10-12
- Group B 4 & 10
- Motion and free fall
- What is motion?
- How does motion occur?
- How do we characterize motion?
- Chp 2: 24-34
- time: t
- position: x(t)
(position is a function of time)
- inertia
- tendency of an object to maintain
its motion if the net force is zero
- Resistance to changes in motion
- measured by mass
- What changes the state of motion of an object? force
- "Primitive notions" of motion
- Aristotle
- Two Gentleman of Verona
- net force
- the sum of all forces acting on an object
- certainly if an object's not in motion, then there's no net force (there are still forces acting on the object)
- rate of speed
- (use the "dirt" formula: d=rt)
- d is distance, r is rate, t is time
- velocity: combination of rate of speed and direction
- Gravity with Tim and Moby with Tim and Moby
- acceleration:
- change in velocity, through
- 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!
- What devices in your car help you accelerate?
- How do you experience each type of acceleration in a car?
- Acceleration with Tim and Moby
- free fall - fall under the force of
gravity, neglecting air resistence
- Galileo and Aristotle
- d=1/2*g*t2
- Exercises:
- Questions for thought: p. 49/1-3
- Group B: 1-3
- Two experiments
Website maintained by Andy Long.
Comments appreciated.