New Seats!
 Find the popsicle stick with your name on it and sit in that
seat
 Begin copying the objectives of the day.
Distance and Time
1.2 pp 11-16
Mr. Richter
Agenda
 New Seats!
 Collect Posters (Rubrics
attached!)
 Video Consent Forms
 Warm-Up
 Finish Yesterday’s Notes (if
applicable)
 Any questions about the quiz?
 Introduction to the Metric
System
 Notes
 Systems of Units (The Metric
System)
 Metric Prefixes and Unit
Conversion
 Distance and Length
 Time
 Distance and Time Graphs
Objectives: We Will Be Able To…
 Know the meaning of metric prefixes
 Express distances using the appropriate metric units.
 Convert between different metric prefixes using decimals.
 Interpret distance and time graphs.
Warm-Up:
 There are 5280 feet in a mile. There are 1000 meters in a
kilometer.
 How many feet are in 4 miles?
 How many meters are in 4 kilometers?
For Tomorrow’s Quiz You Should:
 Review your notes
 Review the slides online
 Pay special attention to things I have repeated
 (Like vocab, objectives, homework problems…)
 Bring a sharpened pencil and be ready to go at the bell
tomorrow
The Metric System
The Metric System
 There are two common standardized systems of
measurement.
 The English (British) system uses inches, feet, yards and
miles.
 The International System (SI) or metric system uses
centimeters, meters and kilometers.
 The vast majority of countries and scientists use the metric
system.
 Why? It’s easier!
The Metric System
 The metric system is based on powers of
10.
 Metric prefixes are used to indicate how
large or how small a unit is.
 Or… how many powers of 10 larger or
smaller than the unit is the measurement.
 For example: 23 kilometers is 1000 times
larger than 23 meters.
 The prefix “kilo-” stands for 1000.
 You will be asked to memorize the list of
prefixes to the right.
The Metric System and Scientific
Notation
 Scientists also use scientific notation, along with metric
prefixes, to indicate very large or very small numbers.
 It looks like:
 23000 meters = 2.3 x 104 meters, oooor…
 0.0046 meters = 4.6 x 10-3 meters
 This is an introduction. We will see this later on in the year.
Don’t freak out yet.
Metric Prefix Practice
 Work by yourself in your
notes to answer each
question.
 Remember to think in terms
of being realistic: are
meters larger or smaller
than the original unit?
 How many meters is:
1. 42 kilometers
2. 4.2 kilometers
3. 0.42 kilometers
4. 4200 centimeters
5. 420 centimeters
6. 42 centimeters
7. 4.2 centimeters
Warm-Up
 Work by yourself in your
notes to answer each
question.
 How many meters is:
1. 42 kilometers
2. 4.2 kilometers
 Remember to think in terms
of being realistic: are
meters larger or smaller
than the original unit?
3. 0.42 kilometers
 If you can, try to do this from
memory; without the prefix
charts.
7. 4.2 centimeters
4. 4200 centimeters
5. 420 centimeters
6. 42 centimeters
Warm-Up
 Convert 589 cm to:
 meters
 kilometers
 millimeters
 (If this is a struggle for you, you must seek extra help ASAP)
Agenda
 Warm-Up
 Review Quiz
 Set Up Portfolios
 Review HW
 Distance and Length
 Distance and Time Graphs
Objectives: We Will Be Able To…
 Know the meaning of metric prefixes
 Express distances using the appropriate metric units.
 Convert between different metric prefixes using decimals.
 Interpret distance and time graphs.
Distance and Length
Distance and Length
 What is measurement?
 A measurement tells you how much of something.
 A measurement requires a quantity and a unit.
 For example:
 If you are asked how far you live from school, you don’t answer
“four”. That makes no sense. You probably mean “four miles”.
Quantity and unit.
Distance and Length
 Distance is: the amount of space between two points.
 Sometimes we refer to distance as position, or the distance
away from zero, the origin.
 Distance is measured in (SI) units of length.






micrometers
millimeters
centimeters
meters (base unit)
kilometers
etc.
Distance and Length
 The graphic below gives an idea as to which units are
appropriate for what size distance.
Time
 For many experiments, time is either an
important factor or the independent variable.
 There are two ways to think about time in
physics.
 Absolute time: when precisely did something
occur?
 September 14, 2011 at 10:14 am
 Relative time: how long did something take to
happen?
 42.3 seconds
 This is called a time interval.
 Most experiments are measured in time intervals,
and data is collected from t = 0.
Distance and Time Graphs
 This graph has three
distinct sections of time.
 Sketch the graph in your
notes, then…
 In complete sentences,
describe what you think
is happening in each
section.
Distance and Time Graphs
 In your groups, sketch the graph (no numbers, just labels) of
the position vs. time of an elevator that:
 Starts in the lobby (ground floor)
 Goes up to the third floor
 Up further to the seventh floor
 And ends up on the second floor.
 If you need help or have questions, ask!
Wrap-Up: Did we meet our objectives?
 Metric prefixes are used to express how much larger or
smaller a quantity is relative to the unit value.
 Distances are measured using the metric units of length:
centimeters, meters, kilometers etc.
 The metric system is used because it is easy to convert
between units of different sizes.
 Distance and time graphs show the relative position of an
object as time passes.
Homework
 pp 24-25 Reviewing Concepts #14, 15, 20
 p 25 #3-5
 p 26 Solving Problems #7