1 / 5

Section 1-2

Section 1-2. How Science Works. Variables. Independent Variable – the variable that you as the experimenter change. What are you testing? Dependent Variable – the variable that changes because of the independent variable. What are you measuring?. Constants and Controls.

cdonnelly
Download Presentation

Section 1-2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Section 1-2 How Science Works

  2. Variables • Independent Variable – the variable that you as the experimenter change. • What are you testing? • Dependent Variable – the variable that changes because of the independent variable. • What are you measuring?

  3. Constants and Controls • Control – the group where the conditions are kept the same; the variable is not used • In a controlled experiment, only one condition is changed at a time. • Constant – everything that is kept the same

  4. Example • John’s lab group compared the effect of different aged grass compost on bean plants. Three flats of bean plants were planted with 25 plants in each flat. The plants were fertilized as follows: Flat A: 450 g of three-month old compost, Flat B: 450 g of six-month old compost and Flat C: 0 g of compost. The compost was made of the same materials and the plants received the same amount of sunlight and water each day. The plants grew for 30 days. After 30 days, the group recorded the height of each plant in centimeters.

  5. Theories and Laws • Theory – an explanation supported by evidence from many investigations. • Natural Laws – recognized as facts of nature

More Related