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Metric SystemMetric System
Scientific Scientific MeasurementsMeasurements
Reflection
How do we measure?Explain and provide examples of how we measure various things in our lives.
Metric SystemMetric System Developed by the Developed by the ______________ in the late in the late ________________..
Based on powers of Based on powers of ________, so it is very easy to use., so it is very easy to use.
Used by Used by ______________________ ______________________ in the world, with the in the world, with the exceptionexception of of
the the ________________..
Especially used by scientists.Especially used by scientists.
Abbreviated SI, which is French for Systeme International.Abbreviated SI, which is French for Systeme International.
Metric PrefixesMetric Prefixes
Regardless of the Regardless of the ____________________., the entire metric system uses the ., the entire metric system uses the
same same ____________________..
Common prefixes are:Common prefixes are:
____________________ = 1000 = 1000
____________________= 1/100= 1/100thth
____________________ = 1/1000 = 1/1000thth
1 meter = 1 meter = ____________________ centimeters= centimeters= ____________________ millimeters millimeters
LengthLength
The SI base unit for length is theThe SI base unit for length is the
____________________ ..
We use We use ____________________ or or ____________________
stickssticks to find the length of to find the length of
objects.objects.
MassMass ____________________ is is the amount of matter that makes up an the amount of matter that makes up an
object.object.
A golf ball and a ping pong ball are the same size, A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the but the golf ball has a lot more matter in it. So the golf ball will have more mass.golf ball will have more mass.
The SI unit for mass is the The SI unit for mass is the ____________________ .. A paper clip has a mass of about one gram.A paper clip has a mass of about one gram.
Measuring MassMeasuring Mass
We will use a We will use a ____________________ ____________________ ____________________ scale to scale to measure mass.measure mass.
Gravity pulls equally on both sides of a balance scale, Gravity pulls equally on both sides of a balance scale, so you will get the same mass no matter what planet so you will get the same mass no matter what planet you are on.you are on.
WeightWeight ____________________ is a measure of the force of gravity on an is a measure of the force of gravity on an
object.object. Your weight can change depending on the force of Your weight can change depending on the force of
gravity. The gravity will change depending on the planet gravity. The gravity will change depending on the planet you are on.you are on.
The SI unit for weight is the The SI unit for weight is the ____________________ (N). (N).
The English unit for weight is the The English unit for weight is the ____________________ . .
Weight and MassWeight and Mass
JillJill EarthEarth
1 1 gravitygravity
MoonMoon
1/61/6thth gravitygravity
JupiterJupiter
2.5 2.5 gravitiegravitie
ss
On orbitOn orbit
0 gravity0 gravity
massmass 30kg30kg 30kg30kg 30kg30kg 30kg30kg
weightweight 300N300N 50N50N 750N750N 0 0 NewtonsNewtons
Notice that Jill’s mass never changes. Notice that Jill’s mass never changes.
VolumeVolume
____________________ is the amount of space contained in an is the amount of space contained in an object.object.
We can find the volume of box shapes by the formula We can find the volume of box shapes by the formula
Volume = Volume = ____________________ x x ____________________ x x ____________________
In this case the units would be In this case the units would be ____________________ _________ ___________ __
So a box 2 cm x 3 cm x 5cm would have a volume of So a box 2 cm x 3 cm x 5cm would have a volume of
____________________
Base UnitsBase Units
The base unit for volume The base unit for volume
is the is the ____________________ .. We measure volume with aWe measure volume with a
__________________________________________________________________..
Graduated CylindersGraduated Cylinders
Liquids form curved, Liquids form curved, upper surfaces upper surfaces when poured into when poured into graduated cylindersgraduated cylinders
To correctly read To correctly read the volume, read the volume, read the bottom of the the bottom of the curve called the:curve called the:
____________________________________
Liquid VolumeLiquid Volume When the metric system was created, they decided When the metric system was created, they decided
that that
____________________ of water of water
would equal would equal ____________________ of water and the 1 mL of water of water and the 1 mL of water will will
have a mass of have a mass of ____________________
____________________ water = water = ____________________ of water= of water= ____________________
Water DisplacementWater Displacement We can use We can use ____________________
____________________ to find the volume of objects to find the volume of objects that are not boxed shaped.that are not boxed shaped.
We can put water in a graduated We can put water in a graduated cylinder. If a rock causes the level cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock must to rise from 7 to 9 ml, the rock must have a volume of have a volume of
____________________ ..
Water Mass and VolumeWater Mass and Volume __________ __________ water = water = __________ __________ of water = of water = ____________________
So what would be the mass of 50 mL of water be?__________So what would be the mass of 50 mL of water be?__________
So what would be the mass of 1 liter of water be?So what would be the mass of 1 liter of water be?
1 L = 1 L = __________ __________ so its mass would be 1000 grams or a so its mass would be 1000 grams or a kilogram.kilogram.
DensityDensity Density is the amount of matter (Density is the amount of matter (__________ __________ ) compared ) compared
to to
the amount of space (the amount of space (__________ __________ ) the object occupies.) the object occupies.
We will measure mass in We will measure mass in __________ __________ and volume in and volume in
__________ __________ or or __________ __________
Density FormulaDensity Formula
Density is Density is ____________________ divided by divided by ____________________ ..
Density = Density = ____________________ / / ____________________ Remember, all fractions are division problems. Remember, all fractions are division problems. Since the unit for mass is grams, and the unit for volume is Since the unit for mass is grams, and the unit for volume is
ml or ml or
cmcm33, then the , then the unit for density is unit for density is ____________________ , or , or ____________________
Density Problem 1Density Problem 1
•Mass = 12 grams
•Volume = 6 cmcm33
•Density = ____________________
•In English we say the density of the object is ____________________
grams
in every cubic centimeter.
Floating and SinkingFloating and Sinking ____________________ ____________________ materials will materials will
____________________ on top of more dense materials.on top of more dense materials.
Objects with a density of less than Objects with a density of less than
____________________ will will ____________________ on top of water.on top of water.
Objects with a density greater than Objects with a density greater than
____________________ will will ____________________ in waterin water..
Objects that Sink!Objects that Sink! Objects with a density Objects with a density ____________________
than than
1 g/mL 1 g/mL will will ____________________ in water.in water.
Comparing DensitiesComparing Densities
•Where is the most Where is the most dense object?dense object?
____________________ __________________
•Where is the least Where is the least dense object?dense object?
____________________ __________________
Density ReviewDensity Review We don’t actually count g’s to find the mass of objects. We don’t actually count g’s to find the mass of objects.
How would you find the mass of a rock?How would you find the mass of a rock?
____________________ ______________________________________ __________________
In real life, how would you find the volume of a rock?In real life, how would you find the volume of a rock?
Use a Use a ____________________ _________ _________ and see how much water the and see how much water the rock rock
____________________ __________________
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