Essential+Questions

Broad to narrow listing: What experiences in life are you accelerating and how do you know? How could you prove it? (Does that lead to Forces?)
 * What exactly is acceleration?

(Alternative: Can two motions that look very different have the same acceleration?) What can you see that is similar between these two motions? Example: Why if you shoot a bullet and drop a bullet, why do they hit the ground at the same time? (gets at difference between constant velocity and constant acceleration) Example: What are situations in life, where acceleration looks different but is the same value?
 * How can acceleration in these two specific situations be exactly the same if they look so different?

What things do you have to measure to describe acceleration? (Could be built up from position, and velocity measurement.)
 * How is measuring velocity different from measuring acceleration? (gets at compound measurement, could get at 6 fundamental SI measurements.)

What tools would you need to measure acceleration? What's the range of accelerations in the real world? (How do we get them to think that acceleration is not binary--to understandings?)

Which of these connects well with our student understanding findings, understandings, knowledge and skills.

FINAL ESSENTIAL QUESTIONS PRESENTED: 1. Overarching: What exactly is acceleration? 2. Unit Level: Does a car have to be accelerating to pass another car? 3. (near)Lesson level: How is measuring velocity different from measuring acceleration?