Bell-Ringers

11 June 2009

Bell-Ringer

• 1st pd, 11 June 2009

• LT: Create an equation for density.

It is common knowledge that a balloon placed in a hot car will expand and may eventually burst. If the balloon expands, happens to the density of the air inside of it?

Explain your answer.

Bell-Ringer

• 2nd pd, 11 June 2009

• LT: Describe the principle of floating and sinking objects.

When loaded, the Titanic had a weight of 46,000 tons. How is it possible that something so heavy could float in water?

Bell-Ringer

• 3rd pd, 10 June 2009

• LT: Review concepts related to density.

What do you think is the greatest stumbling block for students to learn about density?

How might you plan to help students overcome this?

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