pre-lab identify the i.v. and d.v. write a hypothesis. write a problem statement list materials...
TRANSCRIPT
Pre-Lab
• Identify the I.V. and D.V. • Write a hypothesis.• Write a problem statement• List materials• Write a procedure (Think about how you
will collect data to answer the problem question.)
Variables: A quantity that can change!
Independent variable (IV) = decreasing mass
Variable that “I decide what the variable is and how it changes”
Dependent variable (DV) = density
Variable that is measured to see what effect the IV has on it.
Hypothesis
If the ___________________ ___________ Pick a quantity that changes State how it changes
Then the ________________ will__________ State the variable you will State how you measure to see if it changes think it will change
Because ____________________________
State the reason you think the DV will change and how it will change as a result of the changes to the IV
IV
DV
Helpful Tips
Carefully measure each block to the nearest tenth of a cm.
When calculating the final answer round off and use the correct significant figures.
You are writing a rough draft today. Neatness doesn’t count but if you can’t read it later that is not good either.
Calculating Data Equation for Volume: V = l*w*h (Measure CAREFULLY!!!) Use centimeters (cm)
Equation for Density: (Divide mass (in grams) by volume (in cm3))
Density = mass D = m volume V
Problem Question
What is the effect of decreasing mass on the density of the wood?
Independent variable (IV) = decreasing mass
Variable that “I decide what the variable is and how it changes”
Dependent variable (DV) = density
Variable that is measured to see what effect the IV has on it.
Materials and Procedure.Materials1. Ruler2. Mass scale3. Different sized blocks of the same type of wood.
Procdure1. Mass each block of wood. Record.2. Measure and record the length, width and height of
each block of wood. 3. Calculate the volume of each block of wood. Record.4. Calculate the density of each block of wood. Record.
Data table
IV Data to calculate DV
Analysis• What did your data show?• Did your data support your hypothesis?• Valid or invalid?• Use your data to support your claim!
Conclusion• Why did your data show what it showed?• Were there any discrepancies in your data?• Explain why your data is what it is!