S ystem Length tool metric ruler or meter stick Variable length unit meters m ProTips place object you are measuring at the ZERO 0 on the ruler NO YES 2 measure along a straight line ID: 549687
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Slide1
Measuring Length, Mass, and Time Using the Metric SystemSlide2
Length
tool = metric ruler or meter stick
Variable = length
unit = meters (m)Slide3
Pro-Tips
place object you are measuring at the ZERO (0) on the ruler
NO
YESSlide4
2. measure along a straight line
Why is it important to make sure the ruler is straight when measuring?
NO
YESSlide5
each NUMBER on a metric ruler represents a
centimeter
.
each DASH on a metric ruler represents a millimeter.
there are
27
centimeters in this
measurement
4. then there are 9DASHes
past that #5. so we write that as 27.9 cm
now let’s read the metric rulerSlide6
Mass
tool = electric
balance
Variable = massunit = grams (g)Slide7
Pro-Tips
Ensure the unit is correct before using
gSlide8
now let’s read the balance
Step 1 – place mass boat on balance
Step 2 – zero out the balance
0.0 g
2.6 g
YES
NO
mass boatSlide9
step 3 – place item in the mass boatstep 4 – read the mass
** note
mass is the amount of space something takes up
weight is the measure of gravity on an object.
Therefore MASS & WEIGHT are NOT the same thing!
13.5 gSlide10
Time
tool = stopwatch
Variable = time
unit = seconds (s)Slide11
Pro Tips
our stop watches display hours, minutes, second, and milliseconds
your data should always be in seconds (s)
Hour
Minute
seconds
millisecondsSlide12
now let’s read the stop watch #1
this time needs to be converted into seconds.
this reads
2 minutes,
49 seconds
, and
65 milliseconds
there are 60 seconds in 1 minute
60 X 2 =
120 seconds + 49 seconds 169 seconds
the milliseconds go after the decimal
169
.
65
s
Slide13
#2
_______ hours X
60 minutes
= ___________minutes
X
60 seconds
= ____________ (this # tells us how many seconds were in that
hours
on the stopwatch)
______ minutes X
60 seconds = ________ (this # tells us how many seconds were in the
minutes
on the stopwatch)
__________ seconds
_________ milliseconds
Now add up all your second values (there are 3)
_________ + ________ + ______ = __________ (this is the total # of seconds)
_____________ .
__________
total # of seconds
# of millisecondsSlide14Slide15Slide16