• Y8_Density
  • anonym
  • 11.03.2021
  • Physik
  • 8, 9
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The Archimedes principle -
Taking a bath to find the density of objects

1
Watch the video about Archimedes' bath. You find the link and some information on it in the box at the bottom of the sheet.
  • Write down what the king wanted Archimedes to find out and why.
  • Describe which physical quantity of the crown he had to determine and why.
  • Name the two quantities that Archimedes had to measure to find the density of the crown.
2
Now you: find out the density of objects in the PHET simulation. You will find the link in the second box below. There are three categories: intro, compare and mystery. Fill in the table for each category. You can find them on the next side.
Video: How taking a bath led to Archimedes' principle - Mark Salata
Archimedes was summoned by the king to investigate a suspicious goldsmith about his crown. Did the goldsmith mix silver into it?
YouTube-Video
PHET-simulation on density

There are three categories that you can find below. Intro, compare
and mystery. Fill in the according tables with the help of the
simulation.


Link: http://phet.colorado.edu/sims/html/density/latest/density_en.html

Part 1: Intro

material

density

unit

Does it float?

styrofoam

wood

ice

water

brick

aluminium

custom (make up your own)

1
Intro
Look at the density of water and floating objects. Why can they float whilst others cannot?

You can hold floating objects under the water with your mouse to measure their volume.

Part 2: Compare

same mass:
______ kg

volume
L

density
kg/L

Does it float?

blue

yellow

red

green

2
Compare

Use the triangle from the slides to calculate density!

same volume:
______ L

mass
kg

density
kg/L

Does it float?

blue

yellow

red

green

3
Compare

same density:
______ kg/L

mass
kg

volume
L

Does it float?

blue

yellow

red

green

4
Compare

Part 3: Mystery

There are three sets with 5 blocks of unknown material. Can you figure out what each block is made of?

mass
kg

volume
L

density
kg/L

Does it float?

material

1A

1B

1C

1D

1E

5
Mystery

mass
kg

volume
L

density
kg/L

Does it float?

material

2A

2B

2C

2D

2E

6
Mystery

mass
kg

volume
L

density
kg/L

Does it float?

material

3A

3B

3C

3D

3E

7
Mystery