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Nike Shoe Friction Presentation

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Miranda Li

on 27 May 2014

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Transcript of Nike Shoe Friction Presentation

Nike Shoe Friction Investigation and Experiment
Miranda Li, Sean Rossander, Reilly Larcey
Polished concrete/ hallway floor
On which surface type (rough concrete, desk surface, polished concrete (hallway floor), carpet, grass, or asphalt) will the kinetic force be the greatest?
If the Nike shoe was slid across each of the test surfaces, then carpet would require the most kinetic force.
Dry Friction
Static Friction
Kinetic/Sliding Friction
Rolling Friction
Fluid/Viscous Friction
Data Collected
Data Collected
Weight Placed in Shoe
Surface Types
The resistive force between clean dry solid surfaces.

occurs when the two surfaces in contact are not in motion
varies in strength from zero to some maximum value
static force - the force that overcomes the static friction
EX: A person walking on the ground.
occurs when two surfaces in contact are in relative motion
acts on objects when they are sliding over a surface.
is weaker than static friction
kinetic force - the force required to maintain steady sliding
EX: pencil lead on paper
the resistive force experienced by rolling objects
occurs between solid surfaces
acts on objects that are rolling on a surface
is weaker than sliding or static friction.
EX: Any type of wheel that is used to carry or transport an object
the resistive force between surfaces in relative motion through a fluid
the faster or larger a moving object is, the greater is the fluid friction resisting its motion
EX: a swimmer's streamline, a skydiver' parachute

Factors Affecting Friction
Types of material in contact
Coefficient of Friction
describes the ratio of the force of friction between two bodies and the force pressing them together
a number usually between 0 – 1, the higher the number, the stronger the friction
the coefficient is unique to every pair of objects

Factors That Don't Affect Friction
friction is independent of:
surface roughness
speed once an object is moving
mass and/or surface area
Data Collected
Shoe Sole Composition
1. Take one of the shoes and attach it to the spring scale via the hook.
2. While still keeping the shoe attached to the spring scale, drag the shoe across the hallway floor. This floor must be the same floor to keep your results as accurate as possible.
3. Read the measurement given by the spring scale just before the shoe starts to slide and record it on the data table in Newtons.
4. Repeat steps 1-3 until all of the spaces on the data table have been filled up.

Spring Scale
Different types of shoes:
-Rubber soled
-Leather soled
-Shoe with Paper attached to the bottom
-Shoe with carpet attached to the bottom
-Shoe with a Tissue attached to the bottom
Rubber Soled
Shoe with Paper Attached to the bottom
Shoe with a Tissue attached to the bottom
1 Spring Scale
1 Nike Shoe
1 Constant Surface Type (polished concrete hallway floor)
8 weights
- .5 N (2)
- 1.5 N (2)
- 1 N (3)
- 3 N (1)
1. Hook the hook of the spring scale onto the front lace of the shoe.
2. Set the shoe and the spring scale in one straight line.
3. Gather the correct weights so that the combined total of the weights is 1 N.
4. Place the weights in the heel of the shoe so that all the weights can be seen.
5. Have one person slowly drag the shoe across the floor in a constant speed.
6. Another group member should watch the spring scale.
7. When the spring scale is steady, record that number in the data table.
8. Repeat steps 5-7 twice more.
9. Repeat steps 3-8 for the combined weights of 2, 3, 4, 5, 6, 7, 8, 9, and 10 N.
1. Hook the hook of the spring scale onto the front lace of the shoe.
2. Set the shoe and the spring scale in one straight line.
3. Place the weight (3 N) right on the heel of the shoe.
4. Place this whole setting on the hallway floor (polished concrete).
5. Pull the shoe by the spring scale at a constant speed.
6. Record the number on the spring scale on the data table.
7. Repeat steps 4 – 6 twice more.
8. Repeat steps 1 – 7 for the other test surfaces

1. One Nike shoe
2. Six surface types
- Concrete
- Desk Surface
- Hallway floor
- Carpet
- Grass
- Asphalt
3. Constant weight (3 N)
4. One Spring Scale

Shoe with 3 N
Thanks for Listening!
Presentation by:
Miranda Li, Sean Rossander, and Reilly Larcey
Shoe Sole Materials
• In general different types of shoes contain:
- Rubber
- Plastic
- Leather
- Carpet (made for sliding)
• Rubber soles are easily made and provide good traction
• Leather soles do not provide very much traction

Shoe Patterns
• adds and subtracts surface area between the shoe and the floor.
• The texture of the pattern - slides or grips different surfaces.
• the textures of the shoe and the shoe sole pattern will grip any cavity in the ground and give the wearer more traction.
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