Acceleration PREFLIGHT

The following three questions refer to the material you were to read in preparation for the lesson.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page. Don't submit more than once. (If you absolutely HAVE to resubmit it, put a note on the end to that effect.)

# 1. Multiple Choice

When you throw a ball upward, what is its instantaneous velocity and acceleration as it reaches its maximum height (displacement)?
Velocity max, acceleration max
Velocity zero, acceleration zero
Velocity max, acceleration zero
Velocity zero, acceleration max

# 2. Feelings

God gave us sensors to operate in this world, eyes, ears, etc. For example, you could probably eat with your eyes shut because your muscles "know" where they are (usually). This is position sensing. Did God create us with velocity sensors? How about acceleration sensors? What about "jerk" (that's a change in acceleration, not a personality) sensors? Why or why not? How have the presence or absence of those sensors made the physics clearer/confusing for us?

# honors extra

In the book, we derive some equations for position as a function of constant acceleration. When we are driving a car, however, that corresponds to either put the pedal to the floor or removing it. This makes for a very uncomfortable ride. Usually we lift our foot slowly and press it down slowly, achieving a variable acceleration. Assume that the acceleration starts at zero, rises to 1 m/s2, and then tapers off to zero, making an equilateral triangle shape if acceleration is plotted versus time. What is the average acceleration?

Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.