CHAPTER 1, SECTION 5Negative Acceleration: Braking Your Automobile
Do Now
A car is traveling at 60 m/s, the driver sees a stoplight ahead and slows to a complete stop in 10 seconds. What is the car’s acceleration?
A motorcycle is passing a bus on a two lane highway and increases his speed from 40 m/s to 75 m/s in 5 seconds. What is the motorcycle’s acceleration?
Date: September 4, 2012HW: PTG pg. 88, #1-4, Due Friday Do Now (NB pg ?): WDYS WDYT
TB pg. 75 Read Investigate #1-4
TB pg. 76-77
Agenda: Do Now Objective & Success Criteria Investigate Physics Talk Quiz 1.5 PTG
Learning Objective: Explain how negative acceleration relates to braking and stopping distance
Success Criteria: Plan and carry out an
experiment to relate braking distance to initial speed
Determine braking distance Examine accelerated
motion
Investigate: Initial Speed and Braking Distance Materials:
List all materials for your lab today.
How will you use these materials to test initial speed and braking distance?
Investigate
Hypothesis:
With your group come up with a hypothesis for initial speed and braking distance using:
IF__________THEN__________BECAUSE____________statement
Investigate:
Complete #1-3 with your group Check procedures with Mr. LePera Create data table Check with Ms. LePera
HW:PTG pg. 88, #1-4, Due Thurs
Finish procedures and data table Set up and collect data
Remember you are measuring the SPEED at the bottom of the ramp and BRAKING distance in METERS!
Analyze Data Average speed AND distance for EACH
height
HW:PTG pg. 88, #1-4,
Do Now: Find Averages Complete #5 a ,b on pg.
77 One group member draw
your graph on the board Complete #5c-e
Agenda: Do Now Investigate 5-8 Physics Talk
Checking up Quiz
Learning Objective: Understand how negative acceleration relates to braking and stopping distance
Success Criteria: Plan and carry out an
experiment to relate braking distance to initial speed
Determine braking distance Examine accelerated
motion
Investigate #5-8
As a class
Physics Talk
What is negative acceleration?
Draw an example of negative acceleration
Change in velocity with respect to time by decreasing speed in the positive direction or increasing speed in the negative direction
Physics Talk
How do you calculate braking distance?
Vi2=-2ad
vi2
-2a d
Checking up pg. 82, #1-3
HW: None Do Now:
Get out 1.5 PTG #1-4 Discuss answers with
your group
Agenda: 1.5 PTG #1-4 1.5 Quiz Computer Set up (p4) Chapter Challenge Rubric Chapter Challenge Work
Day
Learning Objective: Understand how negative acceleration relates to braking and stopping distance
Success Criteria Calculate negative
acceleration and braking distance
Work on Chapter Challenge
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