Tennessee SPI Objective: Essential Question(s)

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Presentation transcript:

Tennessee SPI Objective: Essential Question(s) SPI 0807.Inq.1A Dependent Variables Date Notes Tennessee SPI Objective: Design a simple experimental procedure with an identified control and appropriate variables. (dependent variable) Essential Question(s) What is a dependent variable? What are examples of dependent variables experiments? I Can Statement I can identify dependent variables in simple experiments.

(Variables and Controls) Also called "Responding Variable" SPI 0807.Inq.1 (Variables and Controls) Notes Science What Is A Dependent Variable? Other factors that change because of the independent variable These are the things that YOU DO NOT CHANGE…they change on their own while you are making observations In other words, anything that "changes on its own" while the experimenter is observing it will be a… Also called "Responding Variable"

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. The independent variable is the distance from the sunlamp Corn plant 01 Corn plant 02 Corn plant 03 What is a dependent variable in this example? HINT: What is a response that will happen without you doing it? A dependent variable is the plant growth

The independent variable is the type of glue 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. She uses 3 types of Elmer’s glue in a series of experiments. Liquid-washable Glue Stick-washable Glue Stick-nonwashable The independent variable is the type of glue What is a dependent variable in this example? HINT: What is a response that will happen without you doing it? Dependent variable-how much force to pull apart the paper

The independent variable is the color of the ink 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) The independent variable is the color of the ink What is a dependent variable in this example? HINT: What is a result from using the different color inks? A dependent variable is how long the ink lasts.