1. SPI 0807.Inq.1 (Variables and Controls) Bellwork 8/27/2015 Fill in the Blank with a Vocabulary word from this week. 1. ____________Variable is the variable you choose to test or change. 2. _____________is the variable that is held constant in an experiment. 3. ____________ Variable is the variable being measured or observed in an experiment. 4.What is the area, if the length is 3m and the width is 6m? 5.What is the volume, if the length is 2km, width is 4km, and the height is 3km?

2. SPI 0807.Inq.1 (Variables and Controls) Agenda 8/27/2015 Review Bellwork (definitions) Emphasize Today’s Objective Finish Notes on Dependent Variable Watch videos and brainpop on variables Do Study Guide on Dependent variables Do worksheet on Measurement WRITE THIS IN YOUR AGENDA! Homework: Study for Friday Voc quiz Worksheet and study guide for dependent variables

3. Tennessee SPI Objective: Design a simple experimental procedure with an identified control and appropriate variables. Notes Science Essential Learning Students will examine the steps of the scientific method and key components of experiments to include independent and dependent variables, and controls. Essential Question(s) What are the steps of the scientific method? What are experiments, and how do I design them to include independent/dependent variables, and controls? 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. SPI 0807.Inq.1 (Variables and Controls)

4. Notes SPI 0807.Inq.1 (Variables and Controls) Science What Is A Dependent Variable?  Often called the "responding variable" because it is the response to the factor that was previously introduced  These are the results that you observe after you introduced the independent/manipulated variable  In other words, anything that "changes on its own" while the experimenter is observing it will be a… Also called "Responding Variable"

5. Example: 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 01Corn plant 02Corn plant 03 What is a dependent variable in this example? HINT: What is the response to the distance from the sunlamp? The independent variable is the distance from the sunlamp A dependent variable is the plant growth

6. Example: A student conducts an experiment with ten 8th grade students. He uses 3 similar types of sour candy in a series of four trials. (Sour Patch Kids, Sour Skittles, and Warheads) He gives 1 piece of candy to each student and records their facial expressions to estimate how sour each candy is. What is a dependent variable in this example? HINT: What is the response to the different types of candy? The independent variable is the type of sour candy A dependent variable is their reaction (facial expressions)

7. Example: 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. Liquid-washable Glue Stick-washable Glue Stick-nonwashable She uses 3 types of Elmer’s glue in a series of experiments. What is a dependent variable in this example? HINT: What is the result from using the different types of glues? The independent variable is the type of glue Dependent variable-how much force to pull apart the paper

8. Example 05: A student conducts an experiment to determine which ink color in ballpoint pens will last the longest before running out. 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) 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. What is a dependent variable in this example? HINT: What is a result from using the different color inks? The independent variable is the color of the ink A dependent variable is how long the ink lasts.