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It's going to be a bumpy one...

Frictional Force = mu(Normal Force)

mu = Frictional Force/Normal Force

Net Force = Mass(Acceleration)

Acceleration = Change in Velocity/Change in Time

Weight (Normal Force) = Mass(Gravity)

Snow Boots

Average Coefficient of Friction = 0.3637943653

Running Shoes

Average Coefficient of Friction = 0.3763406768

Uggs

Average Coefficient of Friction = 0.2306748776

TOMS

Average Coefficient of Friction = 0.2544048296

Flats

Average Coefficient of Friction = 0.1938584397

Coefficient of Friction

VS

Types of Shoes

by Sadie Lee and Raquel Ornelas

WARNING: THIS IS NOT A SMOOTH SLIDE SHOW

Question:

How does the Coefficient of Friction depend on the Types of Shoes, which were slid across an ice rink?

Materials:

  • Different types of shoes
  • Different masses
  • Strings
  • Pennies
  • Scale
  • Ice rink
  • Ruler

Procedures:

1. Chose 5 different types of shoes

2. Find the heaviest shoe and find its mass

3. Put certain amount of masses and other materials into other 4 shoes so that they have the same mass as the heaviest shoe

4. Go to an ice rink

5. Videotape the shoes sliding against the ice

6. Measure the length of the shoes

7. Use Logger Pro to analyze the videos, finding out the velocity and the time

Minimize Error:

- multiple trials

- keeping mass constant

Hypothesis:

Highest Coefficient of Friction to Lowest

1. Snow Boots

2. Running Shoes

3. Uggs

4. Flats

5. TOMS

sole materials?

tread patterns?

EQUATIONS

DATA

Coefficient of Friction VS Types of Shoes

GRAPHS

In Conclusion...

  • Hypothesis = incorrect
  • Nike running shoes had the greatest coefficient of friction - not the snow boots
  • Flats had lowest coefficient of friction - not TOMS

kind of rubber

tread design

depth of tread grooves

1. Running Shoes

2. Snow Boots

3. TOMS

4. Uggs

5. Flats

http://www.ncbi.nlm.nih.gov/pubmed/16427022

http://www.worksafecenter.com/safety-resources/PDF/topic/ergonomics/Slip%20Resistant%20Footwear.pdf

Errors...

  • Friction on the ice - ice was not completely smooth
  • Shoes rotating

Suggestion:

  • Make sure ice is clean

Precision:

Mass of shoes - +/- 0.2g or 0.0002kg

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