Independent Variables

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Presentation transcript:

Independent Variables

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… Also know as….the manipulated variable

Memory Trick! 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…

What is the independent (manipulated) variable in this example? 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 01 Corn plant 02 Corn plant 03 What is the independent (manipulated) variable in this example? Hint: What is the one thing being changed during each trial? The independent variable is the distance from the sunlamp which is connected with the amount of sunlight.

Example: A student uses three types of Elmer’s glue to determine which type has the strongest bond when gluing two pieces of writing paper together. She places 2 grams of glue on each sheet and then measures how much force it takes to pull them apart. Liquid-washable Glue Stick-washable Glue Stick-nonwashable Trial 02 Trial 01 Trial 03 What is the independent (manipulated) variable in this example? Hint: What is the one thing being changed during each trial? The independent variable is the type of glue

What is the independent (manipulated) variable in this example? Example: 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? Hint: What is the one thing being changed during each trial? The independent variable is the color of ink

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Here is an example of a question you might see on a quiz or test.

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Questions Science Here is an example of a question you might see on a quiz or test.

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Questions Science Here is an example of a question you might see on a quiz or test.

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Questions Science Here is an example of a question you might see on a quiz or test.

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Questions Science Here is an example of a question you might see on a quiz or test.

(Independent Variables) SPI 0807.Inq.1A (Independent Variables) Questions Science Here is an example of a question you might see on a quiz or test.