Mass is the measure of the amount of matter in an object Mass and Weight are different Weight is the amount of gravitational force pulling on an object Weight can also change from place to place planet to planet but mass always stays the same ID: 735204
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Slide1
Measuring MassSlide2
What is Mass?
Mass
is the measure of the amount of matter in an object.
Mass and Weight are different.
Weight
is the amount of gravitational force pulling on an object.
Weight can also change from place to place (planet to planet), but mass always stays the same.Slide3
Metric Units of Mass Measurement
Gram (g) – Unit of measurement (starting point)
Milligram (mg) – (1 thousandth of a gram, 0.001, 10
-3
)
Centigrams (cg) – (1 hundredth of a gram, 0.01, 10-2)Decigram (dg) – (1 tenth of a gram, 0.1, 10-1) Decagram (dag) – (ten grams, 10, 101)Hectogram (hg) – (1 hundred grams, 100, 102)Kilogram(kg) – (1 thousand grams, 1000, 103)Slide4
• The units
decigram
,
decagram
and
hectogram are not used as much as the other units. Grams are used to measure the mass of larger things such as candy bars. Kilograms are used to measure the mass of even larger objects like cars. Slide5
Metric Conversions
To convert larger units to smaller ones , you MULTIPLY by units of 10
To convert smaller units to larger ones you DIVIDE by units of 10
Example:
To convert 2 grams to centigrams (1 hundredth of a gram), you multiply by 100:
2 x 100 = 200 cg (2 grams = 200 centigrams)To convert 3 milligrams (1 thousandth of a gram) to grams, you divide by 10003 ÷ 1000 = 0.003 g (3 milligrams = 0.003 g)
1000
100
10
1
0.1
0.01
0.001
Kilogram
hectogram
decagram
Unit
(gram)
decigram
centigram
milligramSlide6
OR
Find out how far apart the two prefixes are on the line above. For example, kilo and
hecto
are one place apart, kilo and
deca
are two places apart, etc.Move the decimal point to the left to convert smaller units or right to convert larger units by the number of places you found in the previous step. If there is no decimal in the number, assume it's after the last digit in the number.1000
100
10
1
0.1
0.01
0.001
kilogram
hectogram
decagram
Units
(grams)decigramcentigrammilligramSlide7
Example #1
To convert 1 kilogram to grams (convert larger to smaller), move the decimal 1 place to the RIGHT and add zeros where needed for the number of places you move down the table.
1 kilogram = 1000 grams
kilogram
hectogram
decagram
gram
decigram
centigram
milligram
1
0
0
0
Decimal Point
Start
EndSlide8
Example #2
To convert 1 milligrams to grams (convert smaller to larger), move the decimal 1 place to the LEFT and add zeros where needed for the number of places you move down the table.
1 milligram = 0.001 grams
kilogram
hectogram
decagram
gram
decigram
centigram
milligram
1
0
0
Decimal Point
Start
EndSlide9
Convert the following measurements
8 grams to centigrams _________
6.568 kilograms to grams _________
2 grams to milligrams _________
9.85 centigrams to grams _________
4 decigrams to grams _________5 milligrams to decigrams _________800 cg6568 g
2000 mg
0.0985 g
0.05 dg
0.4 gSlide10
How to Measure
Mass
You can use a
triple-beam balance
or
hanging balance to find the mass of various objects.
The objects are placed on
the pan
and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.
Once you have balanced the scale, you add up the amounts on each beam to find the total mass.
What would be the mass of the object measured in the picture?
_______ + ______ + _______ = ________ g
300
70
3.4
373.4Slide11
How to Use a Triple-Beam
Balance
1
st
– Place the
object on
the
pan.
2
nd
– Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place.
3
rd
– Repeat this process with the top weight. When the arm moves below the line, back it up one groove.
4
th
– Slide the small weight on the front beam until the lines match up.5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.Slide12
How to Use a Hanging
Balance
1
st
– Place the
object on
the scale.
2
nd
– Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place.
3
rd
– Repeat this process with the top weight. When the arm moves below the line, back it up one groove.
4
th
– Slide the small weight on the front beam until the lines match up.
5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.Slide13
Measuring the Mass of a Liquid
Mass of beaker with liquid
Mass of beaker without liquid
-
=
Mass of the
Liquid
10 grams
3 grams
7 grams
-
=Slide14
Find the mass of the following objects on your desk
Washer __________
Small
D
ensity Cube __________
Two Large Paper Clips__________50 ml beaker (empty) __________20 ml of water __________5.97 g5.20 g
3
g
29.10 g
18.79 g