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

____________________ __________________