Objective:
We will review measurement
with a lab investigation.
 Homework:
• Complete
Measurements Lab!
Objective:
We will review measurement
with a lab investigation.
 Homework:
• Complete “1. Stop and
think: a. and b.” on
Measurements Lab if
not already finished.
• Measurement :
– a determination of
the amount of
something.

What are the two
parts to
measurement? :
Value (a number)
 Unit

• English System
– Most familiar to us
in U.S.
– What units are
common?
• Miles, yards, feet,
pounds, pints,
quarts, gallons, cups,
teaspoons
• SI – International
System of Units
– Used by most
countries and by the
scientific community.
– Metric system based
on factors of 10.
– Common Units?
• Meters, liters, grams,
celsius
• Would you say the
person who shot
this arrow was
accurate or precise?
• Accuracy – how
close a
measurement is to
the accepted value.
• Would you say
these arrows are
accurate or
precise?
• Precision – how
close together
repeated
measurements are
to one another.
• The smallest interval that can be
measured.
– The “sharpness” of a measurement.
~ Write Your Name ~
Objective: We will briefly discuss
conversions and finish our lab
investigation of measurement.
 Homework:
• Complete “Measurements”
lab and answer HW questions
on pg. 5 of lab.
~ Write Your Name ~
Objective: We will briefly discuss
conversions and finish our lab
investigation of measurement.
 Homework:
• Complete “Measurements”
lab and answer HW questions
on pg. 5 of lab.
• Have you ever had to convert something?
Can you give an example?
– Conversions help us to relate quantities.
– Conversion Factor – a ratio that is used
when setting up a unit conversion problem. It
is often used when you want to convert SI
units to English units.
• Ex. - Convert 4.5 ft to cm
(there are 30.48 cm in 1 foot)
• Use the Decimal Point Rule and conversion chains!
King Henry Died By Drinking Chocolate Milk
• Given: How many decimeters in 0.0025 kilometers?
King Henry Died By Drinking Chocolate Milk
• Visual Representations of data that are
used to show how variables are related.
• What are some ways that graphs are
used in our daily lives or in the scientific
community?
• Various Types of graphs:
– Scatterplot graph ( XY graph) – used to
visualize 2 variables thought to be related
– Bar graph – compares data grouped by a name
or category.
– Pie graph – Shows the amount each part makes
up to form the whole (100%)
– Line graph – often shows how data changes
over time.
• Interpreting graphs:
– With scatter plot graphs,
you have 2 variables
• Independent Variable –
might influence another
variable (ex. – water depth)
• Dependent Variable – is
influenced by the
independent variable (ex. –
water pressure)
• Interpreting graphs:
– With scatterplot graphs and line graphs, you
have direct and indirect relationships
• Direct relationship – one variable increases with an
increase in another variable.
– Ex? –
Depth vs. Pressure scatterplot graph
• Indirect relationship – one variable decreases
when another variable increases
• MIXES TUCS:
– Trick to remember how to make a graph
–
–
–
–
–
–
M:
IX:
ES:
T:
U:
CS:
Maximize your graph
Independent variable on x-axis
Equally spaced scale increments
Title (includes axis names)
Units and labels on both axes
Continuous smooth curve connects data
• How to read a graph:
• When measuring time you can answer two
types of questions. What are they?
– 1) What time does the game begin?
– 2) How long does the game last?
(also known as a time interval)
• Name some familiar units of measuring
time:
– Seconds
– Hours
– Minutes
– Years
– Centuries
• Distance – the amount of space between two
points.
– The meter stick is a common tool used for
measuring length
– Do you know the distance you travel to school
each day?
– What units do we use to measure distance?
• Meters, kilometers, light years (1 ly = 9.46 x 1012 km),
parsec (equals about 3.26 ly), miles, feet