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Bell Work

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Bell Work

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  1. Instructions 1) First click on "View" from the top-menu bar. 2) Then click on "Slide Show" from the drop-down menu. 3) Then use the right-arrow button on your keyboard to advance through this presentation. Bell Work SPI 0807.Inq.1 (Variables and Controls) Date Imagine that an engineer has designed a rocket backpack that will enable a person to fly like superman. However, he needs to test it to make sure it is safe enough for people to use, and he wants you to help him with these experiments. 1) Write about some careful ways to test this rocket backpack. 2) Describe some of the scientific tools you would use. 3) Decide how many tests you would conduct, and explain why.

  2. SPI 0807.Inq.1 (Variables and Controls) Science Notes • Variables and Controls in Experiments • Used with the scientific method Scientific Method (In List Format) • Step 1: Make Observations • Step 2: Ask A Question • Step 3: Form A Hypothesis • Step 4: Test The Hypothesis • By doing experiments • Step 5: Analyze The Results • Step 6: Draw Conclusions • Step 7: Communicate results • Use independentvariables when you test your hypothesis by doing experiments (see step 4 above)

  3. SPI 0807.Inq.1 (Variables and Controls) Science Notes • Experiments • In an experiment you should conduct multiple trials How many? More is better! • Experiments should include independent variables, dependent variables, constants, and controls.

  4. SPI 0807.Inq.1 (Variables and Controls) Science Notes Experiments:In an experiment you test or measure a quantity and/or quality of something. Example: Measuring Quantity: Scientists could be testing a new cell phone battery to determine how long it will last when you are text messaging. Example: Measuring Quality: Scientists could be testing new IPod ear buds to determine if they are more comfortable or not.

  5. SPI 0807.Inq.1 (Variables and Controls) Science Notes Independent Variables • In an experiment… • …you should only test for ONE key thing at a time • When you repeat the experiment… • …only change this ONE key thing • This one thing is called… An Independent Variable Also know as….the manipulated variable

  6. SPI 0807.Inq.1 (Variables and Controls) Science Notes • What is an independent variable? • The one thing YOU change each time you duplicate an experiment • Here is our simple memory trick to help you with this. • Independent variable begins with the letter “I” • So remember the letter “I.” • Imagine yourself doing the experiment., and ask yourself… • “What ONE thing will I change when repeating the experiment?” • That one thing will be… The Independent Variable Also know as….the manipulated variable

  7. Video Review SPI 0807.Inq.1 (Variables and Controls) Science • Let's take a moment to watch and • discuss a video-song about this topic • Link: Variables Song by Mr. Edmonds

  8. Example 01:You decide to do an experiment to determine the reason certain soft drinks are more popular that others. You suspect that the popularity of the drinks is connected with the amount of sugar found in them. You decide to use Dr. Pepper, Coke, Pepsi, and Barq's root beer. You first determine how much sugar each drink contains. Then you get 6 students to do a blind taste test with all 4 drinks. What is the independent (manipulated) variable in this example? In other words, what is the one thing being tested for or changed? The independent variable is the type of soft drink

  9. Example 02:A scientist is conducting an experiment to test how sunlight affects plant growth. • She places one corn plant 1 meter away from a sunlamp. • She places one corn plant 2 meters away from a sunlamp. • She places one corn plant 3 meters away from a sunlamp. Corn plant 01 Corn plant 02 Corn plant 03 What is the independent (manipulated) variable in this example? In other words, what is the one thing being tested for or changed? The independent variable is the distance from the sunlamp which is connected with the amount of sunlight.

  10. Example 03: A student conducts an experiment with ten 8th grade students. He uses 3 similar types of sour candy in a series of 4 trials. (Sour Patch Kids, Sour Skittles, and Warheads) He gives 1 piece of candy to each student and records their facial expressions to determine how sour each candy is. What is the independent (manipulated) variable in this example? In other words, what is the one thing being tested for or changed? The independent variable is the type of sour candy

  11. Example 04: A student conducts an experiment to determine which type of glue works best for attaching two pieces of regular writing paper together. She places 2g of glue on each sheet of paper and then uses a spring scale to measure how much force it takes to pull the sheets apart. She uses 3 types of Elmer’s glue in a series of experiments. Glue Stick-nonwashable Liquid-washable Glue Stick-washable What is the independent (manipulated) variable in this example? In other words, what is the one thing being tested for or changed? The independent variable is the type of glue

  12. Example 05: A student conducts an experiment to determine which ink color in ballpoint pens will last the longest before running out. She copies text from her science book. She copies the same text over and over. She writes at the same speed. The room temperature remains the same. She writes on the same kind of paper each time. She uses 3 ink colors in 3 ballpoint pens in a series of experiments. (1) Black ink pen, (2) Blue ink pen, (3) Red ink pen) What is the independent (manipulated) variable in this example? In other words, what is the one thing being tested for or changed? The independent variable is the color of ink

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