UBC PHAS Demonstration Room Catalog

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====== Coefficient Of Friction 2 ======

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===== Description =====

A piece of carpet is pulled using two scales whose readings, when added, give the total frictional force.

Newton's First Law, Second Law, Friction     Last Updated: Jan 13th, 2015



===== Purpose =====

1. To show that frictional force is independent of area of contact.     2. To make use of the F=uR relationship in a demonstration of friction.     

===== Apparatus =====

- Large piece of carpet   - Two scales with rope  - A known weight    

===== Setup =====

- Using a known weight, do a preliminary experiment to determine the coefficient of friction (u) between the carpet and the table.  - With one student sitting on the carpet, have two others drag the carpet and student. With the carpet just moving, read the two scales and add their readings.  - The same total reading should be obtained when the student is asked to lie down on the carpet and the experiment repeated.  - Using the pre-determined value for u, the student's weight can now be calculated using R=F/u.  - A final experiment can be done using the other side of the carpet to show a different F value and hence a different coefficient of friction.    

===== Notes =====



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| **Location** | ---- |
| **Maker** | Unknown |
| **Current State** | Working |
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