Unit 3 INTRO Calculating Density

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Presentation transcript:

Unit 3 INTRO Calculating Density

“Salt Water Rainbow Straw” “Floating Bowling Balls” “Sink of Float: Soda Pop”

What makes it happen? Beginning course details and/or books/materials needed for a class/project.

Archimedes discovered the secret… “Blonde guy telling Archimedes story”

(http://www.watchknowlearn.org/Video.aspx?VideoID=40004) https://www.youtube.com/watch?v=Z50jEi1igNQ

Density! In liquids… Things that are more dense sink to the bottom Things that are less dense rise to the top A schedule design for optional periods of time/objectives.

Which is more dense? Inference: Evidence:

Which is least dense? Evidence: Inference

Which LIQUID is more dense? Evidence Inference

What the heck is density? Density is the amount of matter packed into a certain space. Less dense Introductory notes. More dense

What the heck is density? Density is the mass of a substance divided by the volume of the substance. Density = mass/volume A list of procedures and steps, or a lecture slide with media.

I LOVE DENSITY!

Need to make two measurements Mass The amount of matter in a substance Kinda like how much it weighs Volume The amount of space a substance takes up Kinda like how big it is

Need to make two measurements Mass Measure with a triple beam balance Volume Measure with a centimeter ruler

But How… Mass Start with sleds at 0 100 grams? 10 grams? 1 gram? Volume Little lines are 0.1 cm Measure length Measure width Measure height Volume = l x w x h

Practice Reading

Density units Mass Measure in grams Volume Measure in centimeters 3 times cm3

Another way to measure volume If you’ve got stuff that is not a cube… Put some water in a graduated cylinder Make note of the amount of water Drop in “the thing” Note the new water level Subtract

Metrics is so cool! cm3 = mL

How to calculate Density

One of your Homework Options Remember to calculate the volume and mass BEFORE you pour things together.