Title Page: Title of Lab. Complete the title with this format: (Include bold labels) Good Lab Title(one that indicates what the lab is about).

Purpose: Always written as a complete sentence or sentences and never as a question. For example "The purpose of this investigation is to...

Hypothesis: A statement making a prediction, often an if... then... statement.

Materials: Proper Way: put a list of all used materials.

Procedure: Proper Way: Written in step by step form of what was done during the experiment in the past tense form with correct grammar.

Example: 1. The column was attached to the retort stand.

NOT: We/ I...attached the column to the retort stand.

NOT:...You should attach the column to the retort stand.

NOT: The column is attached. [This is present tense, not past tense.]

NOT: ...Then...

Observations : Table form include all data...only include data, that is no calculations .

Calculations and analysis : Table of Calculations, sample calculations, Also includes both additional analysis and graphs .

Sources of Error: Errors or natural effects which could affect the data. This includes errors in examining, measuring, or calculating values.

Conclusion : A couple of proper sentences answering your purpose and your hypothesis . Include your values that you calculated to answer your purpose .

Purpose: To determine the greatest coefficient of static and kinetic friction for several pairs of objects.

Materials: Mass balance Object A Object B Spring scales Wooden block Sandpaper Masses Plastic Piece Floor String Shoe Desk or Leather

Procedure:

1. Create a chart for all of your data.

2. Measure the mass of object A. Note: You may have to add the masses so that you can pull the object effectively.

3. Use the spring scale to must both th e static frictional force on the object and the kinetic frictional force on the object. Repeat two more times and take the averages.

4. Repeat this process with Object A against each of the other surfaces.

5. Repeat steps 1 -3 for three other objects from group A (against all surfaces). You must test at least one piece of wood, one piece of plastic and one shoe plus one other item of your choice.

Questions:

1. Which type of friction tended to be higher? Static or Kinetic?

2. Rank your object As' from lowest friction to highest friction - both static and kinetic.

3. Rank your object Bs' from lowest friction to highest friction - both static and kinetic.

4. What surface would be best for sliding heavy boxes? Explain your answer.

5. What surface would be best for running a race on? Explain your answer.

6. Will changing the mass of your object change the coefficient of friction for a pair of objects? Explain?

Observations: Observations Chart Name of Name of Total mass of Force of static Friction Force of kinetic Friction Object A Object B object and (in N) (in N) masses (in g) Trial 1 Trial 2 Trial 3 Trial 1 Trial 2 Trial 3 Wooden Sandpaper block 1094.29 6. 80 N 7:20 N 8.0ON 5. 20 N 6. DON / 6. 40 N Wooden Floor block 8.00 N Leather 8. CON 7.20 N 7. 20 N 7. 20 N / 6 0ON Wooden Desk