How are you progressing on your Density Derby Challenge?

1) Are you answering the questions from day 1? You should write the answers in your notebook. Here are just a couple of things we asked:

• Does weight determine if something floats or sinks?
• Does surface area make any difference?
• What about size?
• What is density?

2) List objects/substances we worked with in the lab and their densities. Now determine if they would float or sink in water. Imagine a huge test tube and you are placing all the objects and substances into this test tube. What order would they settle. List them from bottom to top.

3) How do you calculate density? (not just the formula, give examples of what we did in class)

4) What causes something to float of sink in water?

5) Have you seen anything float then sink, or sink then float?

6) Explain how the Galileo Thermometer works.

Monday you will be working on and testing your challenge entry. Tuesday you will present your entry in class (1 per table).

Remember you must have a written scientific explanation of how/why your entry will work. All objects are to be made from things you can find around the house. You can not purchase an item designed to to do this. I will not supply materials.

Have a great weekend!