A lot of people believe that objects float in water because of mass. Just being heavy or light



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Scenario:

  • Scenario:

  • A tree trunk falls during a storm and ends up in the ocean it FLOATS, even though it has a mass of hundreds of pounds.

  • This is because of density

  • I know you must be saying

  • “Density what is that?!”



A block of wood cut into a cube

  • A block of wood cut into a cube

  • It is 10 centimeters long on each side and has a weight of 500 grams

  • Now think about a block of gold cut into the same cube with 10 centimeters on a side

  • What will have more mass the gold or wood?



The block of gold has a mass of 11,000 grams. The wood only 500 grams

  • The block of gold has a mass of 11,000 grams. The wood only 500 grams

  • The two cubes are the same size, or take up the same amount of space VOLUME, but there is more mass in gold than wood. Making it more dense



  • Density is a comparison of how much mass there is in a certain amount of space. ( OR VOLUME)









Formula: Mass/Volume

  • Formula: Mass/Volume

  • Units: Grams and Centimeters3

  • Practice Problem:

  • If your notebook has a mass of 500 grams and a volume of 40 centimeters cubed what is the density



Density= Mass/Volume

  • Density= Mass/Volume

  • Mass= 500 grams

  • Volume= 40 centimeters cubed

  • Density= 500grams/40 cms3

  • Density = 10 grams/cm3

  • Questions???

  • Don’t worry we will practice this A LOT MORE ON WEDNESDAY!!



  • ONE BIG IDEA BEHIND WHY SOME THINGS FLOAT IN WATER OR ANY OTHER LIQUID

  • If it is LESS DENSE THAN THE LIQUID it FLOATS

  • If it is MORE DENSE THAN THE LIQUID it SINKS

  • The density for water is 1.0 g/cm3





  • Would be able to measure LENGTH, WIDTH, and HEIGHT of something like a jagged pebble, a ball, or a toy car?

  • How would you go about finding density? (Hint use water, think about what happens when you get into a pool or bathtub)



  • Step One: Write the formula

  • Step Two: Find the mass of the irregular shaped object . How?

  • Step Three: Fill a beaker with water in mL.

  • Drop the item in the water submerging it or covering it. difference in water is the volume.

  • Now how would we finish solving



  • Liquid Layers

  • What do you think will happen if we pour corn syrup, vegetable oil, and water one by one in a clear container?



Break up into your lab groups quickly and quietly!

  • Break up into your lab groups quickly and quietly!

  • Let’s chat and come up with a hypothesis

  • On the back supply table each group has a clear beaker, 200mL of water colored blue, 200 ml of corn syrup, and 200 mL vegetable oil.

  • Carefully send 2 people over and take your beaker and fluids

  • When I say go we will pour each fluid in one at a time and in the end we get something that…



What is the formula for density?

  • What is the formula for density?

  • What is the density of water?

  • What happens if you pour together liquids that have different densities?

  • Will the liquid on the top have the highest or lowest density?

  • Will the liquid on the bottom have the highest or lowest density?







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