RELATIVE DENSITY

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Will it sink? Or will it float?
Will it sink or will it float? Click To Tweet

THE SECRET OF THE STONE

1. Cover

  • What might be the secret of the stone?
  • What is this story about?
  • What do 3 pigs, a wolf and a dragon have to do with the secret?

2. Need a clever idea

  • What does Wolf want to do?
  • Why can’t he do it?
  • Do you have an idea that may help?

3. at the house of bricks

  • Not nice!
  • Why won’t the pig help?

4. at the house of sticks

  • Would you let wolf in?
  • Would you try to help?

5. at the house of straw

  • Another no!
  • What would you do if you were wolf?

6. huff and puff

  • What’s the pig going to do now?

7. the note

  • What do you think of wolf’s note?
  • What should the pigs do?

8. an idea!

  • What is the pigs’ idea?
  • Will it work?
  • Do you have a different idea?

9. at the creek

  • The rocks feel lighter in water?
  • Why?
  • AHA? What new idea do the pigs have?

10. Success!

  • It worked! They lifted the stone!
  • What difference did the water make?
  • What might be the secret on the tablet?

11. TIME to rest

  • They seem happy.
  • And tired.
  • Are they becoming friends?

12. the house of straw is fixed

  • That was nice of wolf!
  • What should the pigs do now?

13. BE KIND

  • What do you think of the secret on the tablet?
  • If you could share a secret of life, what might it be?

14. the end

  • The pigs look a bit apprehensive.
  • What might happen next?
  • How would you continue this story?

15. an experiment

Materials you need:

  • a spring scale that measures 500 grams
  • various masses (100-500 grams)
  • a bowl of water

Try this:

  • hang a 500 gram mass on the spring scale
  • what is the reading on the scale?
  • move the scale so the mass is submerged in the bowl of water (but not touching the bottom of the bowl)
  • what is the reading on the scale?

16. eureka!

Read about Archimedes and his “eureka” experience at https://en.wikipedia.org/wiki/Eureka_(word)

17. will it sink or will it float?

Imagine this:

  • you are standing in front of a pond
  • you pick up a tiny pebble and you throw it in the water
  • will it sink or will it float?

Now imagine this:

  • you pick up a heavy log and you throw it in the water
  • will it sink or will it float?

18. in a song

LIGHTER IN WATER

A song of Grade 1/2 student comments after exploring the weights of masses in and out of water.

19. relative density, coding + art

relative density art

Let’s use the coding app at: https://researchideas.ca/density/

Below the canvas, there is a list of 2 objects: Object 1 and Object 2.

OBJECT 1

In the list of objects:

  • click to select Object 1
  • in the code window, you can see the code attached to this object
  • notice that the object’s density is 1.1
  • the canvas density is 1.0, so this object is more dense, which means it will sink
  • under the code window, click on Run This Code to set the object in motion
Object 1

Change the density of Object 1:

  • click to select Object 1
  • change the density to 1.5
  • click on Run This Code
  • what is the difference?
  • try a density of 5
  • notice the difference?

OBJECT 2

Refresh your browser window to reset the app.

In the list of objects:

Object 2
  • click to select Object 2
  • in the code window, you can see the code attached to this object
  • notice that the object’s density is 10.9
  • the canvas density is 1.0, so this object is less dense, which means it will float
  • under the code window, click on Run This Code to set the object in motion

Change the density of Object 2:

  • click to select Object 1
  • change the density to 0.5
  • click on Run This Code
  • what is the difference?

OBJECTS 1 AND 2

Refresh your browser window, to reset the app.

Let’s see the 2 objects interact:

Objects 1 and 2
  • under the code window, click on Run All Code to set both objects in motion
  • what happens when they collide?
  • which object, and what part of its code, determines what happens when they collide?

Change the collision effect:

  • click to select Object 1
  • change the density to 0.5
  • click on Run This Code
  • what is the difference?