Bell Ringer Pumice is a volcanic rock that floats on top of water. All other rocks will sink in water. With your group, why do.

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Presentation transcript:

Bell Ringer Pumice is a volcanic rock that floats on top of water. All other rocks will sink in water. With your group, why do you believe Pumice rock floats? Answer on White board.

Measuring Density (page 8) *Density - How much mass is in a given amount of space (volume) **The ratio of matter to volume in an object or substance

*Units - g/cm³ (grams per centimeters cubed, or grams per cubic centimeter)

4. Measuring Density *How to calculate: 1 – Measure the mass of the object 2 – Measure the volume of the object 3 – Calculate the density Density (D) = Mass (M) ÷ Volume (V) D = M ÷ V

4. Measuring Density 1 – Measure the mass of the object Object 1 Object 2 100 g 600 g

4. Measuring Density 2 – Measure the volume of the object Object 1 Object 2 10 cm x 5 cm x 4 cm 10 cm x 5 cm x 4 cm = 200 cm³ = 200 cm³

4. Measuring Density 3 – Calculate the density (D = M ÷ V) Object 1 Object 2 D = 100 g ÷ 200 cm³ D = 600 g ÷ 200 cm³ = 0.5 g/cm³ = 3 g/cm³

Measuring Density *How much mass is in a given volume

Density Mass = 4000g Volume = 5000 mL Density = 4000g ÷ 5000 cm³

Density Mass = 10,000g Volume = 5000 mL Density = 10,000g / 5000 cm³

Density 0.8 g/cm³ 2 g/cm³

What causes an object to float on water instead of sinking?

Water has a density of 1.0 g/cm³ Objects with a lower density than water will float, with a greater density will sink

Density 0.8 g/cm³ 2 g/cm³

Here We Go https://www.youtube.com/watch?v=zlkpZZW29b0

Closing Quick Write – You have a foam ball and a bowling ball that are identical in size. Explain, in detail, why the foam ball would float in a tank of water, but the bowling ball would sink. *Do this below your notes