u1c1a4 evaluating experimental design. exp 1: heating earth materials 1q: if the type of earth’s...
Post on 14-Dec-2015
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Exp 1: Heating Earth Materials
• 1Q: If the type of Earth’s material is changed, what happens to the temperature of the material as it is heated by sunlight?
• 6. Differences other than MV and RV:
• Yes, the amount of Earth material
• Full bucket soil, 1/2 bucket water
• 7. No, this is not a fair test - more than one variable - see answer to #6.
• (amount of Earth material varies)
Exp 2: Freezing Water
• 1Q: If hot and cold water are placed in a freezer, which freezes more quickly?
• 5. Same/control:
• tray size
• amount of water added in each tray
• liquid used is water
• 15 minute interval checks
• both put in the same freezer
• 6. Different other than MV and RV: Yes.
• The trays are made out of different material (metal, plastic), and they are place on different shelves in the freezer
• (top, bottom)
• 7. This experiment is NOT a fair test because of #6, more than one variable (tray material and location).
Exp 3: Corn
• 1Q: If the type of corn seed is changed, what happens to its growth rate and health in crowded conditions?
• 5. Same/control:
• same number of seeds in each pot, same pot sizes
• same depth planted
• same amount of water
• all checked at same time (3 weeks)
• Conclusion: You should be able to answer/identify the 7 criteria used in this activity to determine if an experiment is designed fairly:
• 1Q• 2: MV, RV• 3: values MV• 4. RV measurement• 5. Same controls• 6. Different variables• 7. Answer (Fair, yes or no)
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