Review Chapter 11 Quiz 1

1
Class Topics
Title General Science 9//07
Objectives

• To assess learning about speed.

• Review Chapter 11 Quiz 1
• Velocity
• Prepare for Speed lab
• Acceleration
• "I made it hard and difficult for kids because
  they don't get anything out of it if it's easy."
• Bob Knight

Handouts
Friday, November 20, 2009 622 PM
2
Class Assignments
By When
What

• Due this class period
• Due next class period
• Due in the future

3
Velocity

• Description of both speed and direction of motion
• Vector
• Velocity can change
• Due to change in speed
• Due to change in direction

4
Chapter 11 Quiz Review
5
Motion Lab

• Walking velocity
• 10 m distance
• 1 m increments
• Jobs walker, timer, recorder
• Walker starts behind the start line
• Walks 10 m
• Timer
• starts watch and calls out time at each meter
• Recorder
• Writes down times for walker

6
Acceleration

• The rate at which velocity changes
• Changes in speed, direction, or both
• Acceleration is a vector
• Can be an increase or a decrease
• SI units
• Meters per second per second
• m/s2

7
Acceleration

• Figuring acceleration
• a (vf-vi)/t
• a acceleration
• vf final velocity
• vi initial velocity
• t time

8
Find the acceleration

• 2005 Ford GT
• 0-60 mph in 3.3 seconds
• 1971 Ford Pinto
• 0-60 mph in 18.0 seconds
• 2002 Chevrolet Corvette
• 0-60 mph in 4.1 seconds
• 1980 Chevrolet Chevette
• 0-60 mph in 15.8 seconds

9
Speed (mph)
Time (s)
10
Interest Grabber
Section 11.3

• Speed-Time Graphs
• The speed an object travels in a period of time
  can be expressed on a graph. This type of graph
  can give useful information about the objects
  motion. The speed-time graph of the object in
  Section 11.2 Interest Grabber is shown below.

1. Describe the speed of the object shown on the
graph. 2. The slope of the line on a
distance-time graph represents the change in
distance (m) per the change in time (s). Thus,
the slope of a distance-time graph gives speed
(m/s). What information does the slope of a
speed-time graph give you? 3. What is the slope
of the line on the speed-time graph?
11
Lab Reports

• Lab Journal
• Table of contents
• Experiment number, title of experiment, and page
  number in the notebook
• Use on front sides of pages, do not skip pages

12
Prelab Preparations

• List your name, your partners name, and class
  period in the upper right hand corner of the page
  
• First section
• Purpose/Question
• Typically a single sentence
• Hypothesis
• What do you think the answer to your questions
  is?
• Rationale
• Why do you think your hypothesis is correct?
• Skip a line between each answer and three between
  section 1 and section 2

13
Prelab Preparations

• Second Section
• Materials
• List all materials used
• Procedure
• Summarize the procedure used for the
  investigation
• Can be a list or flow chart needs to be easily
  read
• Getting Ready
• 1. What potential procedural problems do I want
  to avoid to eliminate error?
• 2. What safety precautions must be taken?
• 3. How will I analyze the data?
• Be specific

Skip a line between each answer and three between
section 2 and section 3
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Prelab preparation

• Sections 1 and 2 can (and should) be completed
  prior to coming to class
• They must be initialed by a teacher as completed
  before you can start the lab!
• Section 3 can be prepared before class, but not
  completed

15
Third Section

• Results
• Dominated by tables/drawings
• Construct the table clearly (use a ruler)
• Information should be written as collected
• Not copied from lab partner at a later time
• Must be clearly labeled and include units
• Statements for observations

16
Third Section

• Analysis
• Show your work from Statement 3 of getting
  ready
• Sample calculation
• Word equation
• Quantatitive equation
• Graphs (of data in tables)
• Number and title graphs
• Neat and sized appropriately
• Axis labeled with units
• Independent on x an dependent on y

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Fourth Section

• Conclusion
• What is the significance or meaning of the
  results?
• Written in third person passive
• Summarize the results
• Detailed discussion of the results
• How do the results compare to what you expected?
• Can compare with results of others
• What factors might have contributed to errors in
  the results
• Analyze experimental error

18
Walking/Car Lab

• Set up notebooks and begin prelab

19
Questions
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