Bell Work 9/4/2014 A group of students is conducting an experiment to see how light affects the growth of tomato plants. The group has three separate tomato plants. They place the first tomato plant in direct sunlight, the second tomato plant in constant shade, and the third tomato plant under a heat lamp. They will measure the growth of their plant over the next two weeks. What is the independent variable in the students’ experiment? Explain how you know. A plant growth Btomato plants Clight exposure Dtwo weeks

Agenda 1. Bell Work 2. Word Wall/ Academic Vocabulary Review 3. Variables Practice 4. Blood Demonstration 5. Exit Ticket Objective: I can identify controls and variables in an experiment. I can organize data in an experiment.

Controlled Experiment An ___________ _______ is a group whose conditions are __________ or ___________. A factor that _________ in an experiment in order to test the hypothesis is called a ___________. The ___________ __________ are the factors that you choose to change in the experiment. The ___________ __________ are what change naturally in the experiment because of the independent variable. experimental group changed manipulated changes variable independentvariables dependentvariables

The Variables Song

New Vocabulary: Scientific Models A _______ is a representation of an object or system. They explain how something works or describe the structure of something. Examples of models:  Physical model- model volcano  Mathematical model- graph or chart  Conceptual model- system of ideas or theories. model

New Vocabulary: Types of Graphs Bar graph: used to present and compare data. Line graph: show relationships between the data and display a change over time. Pie chart: used to represent categories of data or values of variables (out of 100%...). Scatter Plot: used to investigate the possible relationship between two variables that both relate to the same "event." For example, a scatter plot could let you see if there's a relationship between population and crime levels.

Scatter Plot Pie Chart Bar Graph Line Graph

New Vocabulary: Controlled Experiment Results Cause and Effect  The ________ is the reason for the result.  The ________ is the result.  For example: Because the plant had no sunlight (cause), it died (effect). Conclusions  A ____________ is when you compare your hypothesis with the results of the experiment. cause effect conclusion

New Vocabulary: Theory vs. Law An explanation that ties together many hypotheses and observations is called a theory; NOT 100% proven true.  Example: The Big Bang Theory A law is a statement of what will happen or an explanation of how things work.  Example: The Law of Gravity

Blood Demonstration You will observe and collect data during the demonstration. You will then practice recording your data using the sheet provided. Remember to reference your academic vocabulary for help.

Practice Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks. Objective: I can identify controls and variables in an experiment. I can organize data in an experiment.

Practice Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to check this this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower. Objective: I can identify controls and variables in an experiment. I can organize data in an experiment.

Exit Ticket Krusty was told that a certain itching powder was the newest best thing on the market, it even claims to cause 50% longer lasting itches. Interested in this product, he buys the itching powder and compares it to his usual product. One test subject (A) is sprinkled with the original itching powder, and another test subject (B) was sprinkled with the Experimental itching powder. Subject A reported having itches for 30 minutes. Subject B reported to have itches for 45 minutes Objective: I can identify controls and variables in an experiment. I can organize data in an experiment.