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Coefficient of Static and Kinetic Friction Phys 10 IB LAb

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Introduction

dan Stoica                April 1st, 2009

Coefficient of Static and Kinetic Friction

Problem:Is there a relationship between mass and the coefficient of static and kinetic friction?

Variables:  

                The manipulated variable is the weight of the object that is being pulled.

The responding variables are the static friction, kinetic friction, and the coefficients of those.

The controlled variable is the amount of weight that is added each trial, and the starting point on the scale.

Materials:

  • Wooden Block
  • Spring scale
  • String
  • 4 x 200 g masses

Procedure:

  1. Determine the weight(normal force) of the wooden block.
  2. Attach a string through loop around a wooden block as shown in the diagram.
  3. Adjust the force scale to zero while it is in the horizontal position.
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Middle

image01.png

image02.pngimage02.pngimage01.pngimage01.png

image02.pngimage02.png

Calculating Normal Force on Trial 1:
image01.pngimage01.png= mg

image01.pngimage01.png = (0.23817±0.001kg) (9.81ms¯²)
image01.pngimage01.png= 2.34±0.01N

Calculating the Coefficient of Static Friction:
image03.pngimage03.png
image04.pngimage04.png                
image05.pngimage05.png
                

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Conclusion

Improving:

        More trial measurements could be taken to improve the accuracy of the coefficients of static and kinetic friction. The scale should be electronic or newer to lead to more accurate measurements of static and kinetic friction. An accurate machine should pull the scale and the object so there is less error in the measurement.  The surface should be the same throughout the whole area, and there should be nothing on it that could cause errors in measurement.

Page  of

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