Density.

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Presentation transcript:

Density

Sink or float? For this activity you will work in your table groups You will be given 10 objects. You need to create 5 pairs For each pair you need to write down 3 observations and predict which one will sink and which one will float, then write your results You will be given 15 minutes for this activity

But first, Some important vocab Matter: anything that has atoms, mass, and takes up space Mass: A measurement of the amount of matter (or stuff) in an object or liquid Volume: A measurement of how much physical space an object or liquid takes up.

Which one is more dense? Which square is more dense?

Which one is more dense? Now which one is more dense?

What is density? Density is a comparison of how much matter there is in a certain amount of space. To find the density of an object, we use a simple formula D=m/v

How do we find volume? To find the volume of a regular object you take the Length x width x height Length Height Width

x What is density? Don’t forget our units! Mass= grams (g) Volume= cm3 or mL Density= g/ cm3 or g/mL Hint: 1 cm3= 1 mL Mass Density x Volume

Guided Practice Find the volume of a square that has a l=4 cm, w=5 cm, and h=3 cm Given: Unknown/Units Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3 Given: Unknown/Units: Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3 Given: v= 60 cm3 and m= 20g Unknown/Units: Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3 Given: v= 60 cm3 and m= 20g Unknown/Units: Density= _________ g/cm3 Equation: Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3 Given: v= 60 cm3 and m= 20g Unknown/Units: Density= _________ g/cm3 Equation: D=m/v Substitute/solution:

Guided Practice Find the volume of a square that as a l=4 cm, w=5 cm, and h=3 cm 2. If I told you the mass of that same square of 20 g, what would the density of the square be? Given: L= 4 cm, W=5 cm, h= 3 cm Unknown/Units: Volume=_____________ cm3 Equation: V= L x W x H Substitute/solution: V= 4 x 5 x 3= 60 cm3 Given: v= 60 cm3 and m= 20g Unknown/Units: Density= _________ g/cm3 Equation: D=m/v Substitute/solution: D= 20/60= .33g/cm3