TOPIC: Measurement
Aim: Describe the metric system and how to
measure length.
Do Now:
1. Pass up in last night’s HW (Graph)
2. Copy the Topic and Aim.
3. Tape Scientific Method Practice # 4 into
your ISA section and start it.
HW: Finish ISA activity, Study for Thursday’s
lab safety quiz
10 23 39 48 64 77 87 98
INCORRECT!!!
The scale has no CONSISTENT interval.
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
CORRECT!!!
The scale has a CONSISTENT interval.
It goes by 5’s.
10
15
20
25 30 35 40 45 50
55
INCORRECT!!!
The number of boxes between the numbers
is not the same.
50
55
60
65
70
75
80
85
90
CORRECT!!!
The number of boxes between numbers is
the same.
There is a consistent interval.
20
40
60
80
100
120
CORRECT!!!
There is a consistent interval.
The number of boxes between each number
is the same.
0
10
20
60
65
70
CORRECT!!!
No consistent interval.
75
80
85
90
0
10
20
60
65
70
75
80
85
90
INCORRECT!!!
The numbers are not beneath the lines. They
are between the lines.
The driver of a tractor-trailer truck that was more
than 13 feet tall attempted to drive under a 12-foot
bridge. According to spokesman Stephen
MacDonald, the truck was carrying chemicals. The
city’s hazardous materials team responded, but no
chemicals or fuel ultimately leaked.
Unit
• A known amount of
measurement
• Ex: Yard, meter
2 Systems
1. METRIC SYSTEM
• Used by most of the world
• SI units
2. ENGLISH SYSTEM
• inch, foot, ounce
Did you know…?
• The metric system is much easier. All
metric units are related by factors of 10.
• Nearly the entire world (95%), except
the United States, now uses the metric
system. U.S. economic competitiveness
would be strengthened by converting to
the metric system.
LENGTH
• METER (m)
• Ruler/meter stick
A
B
How many millimeters are found
in 1 centimeter?
10mm = 1cm
LENGTH
• METER (m)
• Ruler/meter
stick
• 1cm = 10mm
A
B
C
D
E
F
1. Measure the length of the paper clip in
cm to the nearest tenth. 1.8cm
2. Measure the length of the paper clip in
mm. 18mm
1. Measure the length of the pencil in cm
to the nearest tenth. 7.5cm
2. Measure the length of the pencil in mm.
75mm
• 1 cm = 10 millimeters
• 1 m =100cm = 1000mm
1 mm = width of a dime
• 1 kilometer (km) = 1000m
- Kilo = 1000
Let’s summarize…
1. Explain the DIFFERENCE between the
two systems of measurement.
2. What are the SI units for length?
3. How many cm make up a m?
4. How many mm make up a cm?
5. How many mm make up a m?
6. How many m make up a km?
0 cm
1
2
3
4
What is the length of the object in
centimeters to the nearest tenth?
Millimeters?
1.6cm
16mm
0 cm
1
2
3
4
What is the length of the object in
centimeters to the nearest tenth?
Millimeters?
1.9cm
19mm
Which group of measurement
units is correctly arranged in
order of increasing size?
1. mm, cm, m, km
2. mm, km, cm, m
3. m, km, cm, mm
4. km, cm, mm, m
In the metric system, the
height of a building would
be given in
1. centimeters
2. milliliters
3. meters
4. millimeters
In the metric system, the
width of a textbook
would best be given in
1. centimeters
2. milliliters
3. meters
4. liters
A factor in an experiment that
remains constant is called a
1. control
2. variable
3. theory
4. hypothesis
The results of one experiment carried
out by a research team would be
considered valid if
a. the experiment had no control setup
b. all the members of the research team
came to the same conclusion
c. the experiment had more than one
variable
d. the experiment was repeated and the
same results were obtained each time
An investigation was designed to
determine the effect of ultraviolet light
on mold spore growth. 2 groups of
mold spores were grown under
identical conditions, except 1 group
was exposed only to UV light, while the
other group was grown in total
darkness. In this investigation, the
group of mold spores grown without
receiving any UV light is known as the
a. experimental variable b. hypothesis
c. control group
d. limiting factor
The first step in the scientific
method is
a. to state the problem
b. experimentation
c. to state the hypothesis
d. observation
An educated guess to the
problem of an experiment
is known as a
a. variable
b. theory
c. hypothesis
d. law
When performing an
experiment, you are testing
the
a. problem
b. hypothesis
c. data
d. conclusion
The hypothesis is based on
the
1.conclusion
2.dependent variable
3.data collected
4.background research
Your senses can be used to
make a(n)
a. observation
b. conclusion
c. hypothesis
d. problem
To test the effect of hormones on plant height, the
height of 6 potted plant seedlings of the same
species were measured and then sprayed
with a growth hormone. After 4 weeks of
growth under ideal conditions, the height of
the plants were measured again.
1. How would you set up the control group?
6 plants sprayed with water
2. Identify the independent and dependent variables.
Independent variable: growth hormone
Dependent variable: plant height
3. Give 2 factors that must be kept constant.
Species, sunlight, same amount of soil