I know you just finished the density derby challenge, but I have another one for you. Here’s the challenge. Devise a way in which you can lift a person by using your breath — OK I know what some of you are thinking — I don’t mean to knock someone off their feet with your bad breath!

I haven’t tried this myself yet, but I heard it can be done. I’ll be experimenting during the week to see if I can do it.

Test your ideas and the first person to successfully demonstrate this in class will earn 10 points on their next test.

Good Luck.

Congratulations on the many fine entries in the Density Derby Challenge, you showed creativity and understanding of the principles of density. Next week we’ll continue to look at forces in fluids examining buoyancy and Bernoulli’s Principle.

Here’s a link that explains how Galileo’s thermometer works. Check it out.

Density Derby Challenge:

#1-5 to be submitted by each student:

1) Written quality observations of at least 5 demonstration stations (20 points)

2) Answers to day 1 questions, should be at least 5 questions (20 points)

3) Filled test tube with substances in the proper order (1 point each, max 20 points)

4) Scientific explanation of how Galileo’s Thermometer works (20 points)

5) Scientific explanation of how your derby entry will work (20 points, plus this is required to submit an entry object)

#6 One derby entry per table

6) Derby entry results (100 points)

- object either sinks or floats — 70 pts
- object sinks and floats — 80 pts
- object sinks then floats within 50-70 seconds — 90 pts
- object sinks, stays down for 60 seconds (rounded to the nearest whole second) then floats — 100 pts