 A student conducts an experiment to determine which type of glue work best for attaching two pieces of paper together.. Experimental Group (A) Uses 3 types of Elmer’s glue in a series of experiments (Liquid-washable, Glue Stick-washable, Glue Stick-nonwashable) She places the same amount of glue (2g) on each sheet of paper Control Group (B) Uses one types of super glue in a series of experiments She places the same amount of super glue (2g) on each sheet Identify the following: (1) Independent and dependent variable(s) in the experimental group (2) Constants Feb 04, 2013 Bell work SPI 0807.Inq.1 Controls and Variables 1

Experimental group (A) All the details of the series of experiments using the 3 similar types of Elmer’s glue Control group (B) All the details of the super glue series of experiments Independent and Dependent variables -Independent: The different types of Elmer’s glue -Dependent: How well/how poorly the paper stayed together These are some constants -Use the same amount of paper (2 pieces) -Used the same amount of glue on each piece of paper (2g) SPI 0807.Inq.1 Controls and Variables Bell work 2 NOTE: The super glue is the control variable!

1 ) Discuss objective and bell work 2) Ask about birthdays 3) Start gum chewing experiment  (see next slide for more details) 4) COPY IN YOUR AGENDA: No Homework: PLAN SPI 0807.Inq.1 Controls and Variables 3 Silly Thought Sometimes I wonder to myself… …”Why is that Frisbee getting bigger?” (Then it hits me)

Question: Does the mass of gum increase or decrease when you chew it? Tasks: A) Make a prediction and a hypothesis statement. B) Chew 3 different pieces of gum. Measure the mass of the gum before and after you chew them. C) Record your observations in a chart D) Write a conclusion E) Identify independent and dependent variable(s) F) Identify the constants G) Think of a control experiment you could do and describe it Experiment SPI 0807.Inq.1 Controls and Variables 4