Energía - Friction Coefficient Lab – 18/04/18

Energía - Friction Coefficient Lab – 18/04/18

Name Emiliano Chamandy

Name Alejandro Luna

Name

Objective: Find the friction coefficient between a wooden block and the lab table by experimentation and analysis.

Submission details.

• Teams of 5-6. There can only be six teams because there are only 6 sensors.
• The complete report is to be handed in printed at the end of class Friday the 20th 

Material Needed.

• Vernier Force Sensor
• Vernier Lab Quest.
• Computer with Logger Pro.
• Wooden block
• Set of different masses.
• String

Methodology.

You will perform an experiment to determine the static friction coefficient between the wooden block and the lab table.

For this you must connect the force sensor to the lab quest and the lab quest to your computer. Then you will tie a piece of string between the sensor and the wooden block shown in Figure 1.

[pic 2]

Figure 1. Experiment setup

To begin the experiment, first make sure that when the string is not on tension the reading on your computer is 0 or very close to 0. If it is not Click on the Zero button on Logger Pro to calibrate, it’s next to the Collect button.

Star the experiment by clicking the collect button and gently start pulling the sensor away from the wooden block, keep increasing the force until the block starts sliding, and stop the data collection. You should get something like Figure 2.

[pic 3]

Figure 2. Typical experiment reading.

The maximum value of the force registered is the maximum static friction force, just before the body begins to move. Look for the exact value in the force column and register it on your tables.

Make sure you always pull in a direction parallel to the axis of the sensor like show in figure 3 and 4.

  [pic 4]              [pic 5]

Figure 3. INCORRECT way to pull.                                        Figure 4. CORRECT way to pull.        

Data collection.

In order get a more accurate result you will need to perform the experiment with different masses placed over the wooden block (you will use an electronic balance to measure each mass system) you will use 4 different values of masses. In addition to this for each mass value you will make the experiment 10 times. A total of 40 readings will be collected.

PART 1 [6 marks]

DATA COLLECTION TABLE

Construct a raw data table like the ones you have used in the previous labs. Include uncertainties and clear headings with units.

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