When Nathan comes home from school he is always hungry. He loves to eat a salty snack, but he knows that salt (also called sodium) is not good in large amounts. He is confused on the amount of snack that he eats in comparison to the amount of sodium listed on the label. He and his mother look at the label and try to decide which snack, cheerios or pretzels, will be the best choice for Nathan. His mother wants him to not eat too much sodium or calories, since dinner is only a few hours away. he wants to eat a snack, but still wants dinner.
Which snack will be the best for Nathan? Justify your answer.
1. Your group will be getting 20 pretzels and two cups of cereal. How many grams do you hypothesize one serving size is? Complete the document via Classroom by Google.
2. Let's discuss how to read labels and what items you can find on a NUTRITIONAL LABEL.
3. Let's measure (in grams) the amount of pretzels and cereal you hypothesized as one serving. Complete your document! and answer: Which snack will be the best for Nathan? Why?
4. Was this a fair test? Should there be more trials? What tools do advertisers use to sell their product?
I'll Huff and I'll Puff
1. Puffing Machine - What is a fair test?
2. Observe your objects and classify them into two groups: those you predict can be moved by a puff or air from the machine and those you predict cannot be moved. Then, record your prediction on the data sheet.
3. Discuss and agree on a plan before beginning your investigation.
4. Run the investigation - record your findings on the data sheet.
5. Compare and discuss your predictions with your actual findings.
BLOG Post: Was this a fair test? What are your reasons? What variables were kept the same? Which variable was changed and why? What could be done to improve your experiment?
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Puff Machine
Today you will compare materials in an unfair test and discuss ways of conducting a fair test.
1. Let's discuss what a fair test is (variables, controls, what makes a fair test)
2. You will use a puffing machine to conduct a fair test. You will test your machines with each of the different materials and record the data collected.
3. Then, you will blog about your results and answer the following questions:
a. Was this a fair test?
b. What is your claim about the investigation?
c. What is your evidence?
d. What is your reasoning?
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