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Sticky Sneakers (DOC)

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					Sticky Sneakers
Introduction: the appropriate athletic shoe for an activity should have a specific type of tread to grip
the floor or the ground. Three types of sneakers were tested for different forces of friction needed by
the person wearing the shoes.

Athletic shoes are designed to deal with various friction forces, including these:
    Starting friction, which is involved when you start from a stopped position
    Forward-stopping friction, which is involved when you come to a forward stop
    Sideways-stopping friction, which is involved when you come to a sideways stop

The data below was gathered by measuring the amount of friction between the sneakers and the gym
floor. The mass of each sneaker was increased to 1000 g; mass was measured in Newtons using the
same spring scale for each trial. Data has been averaged.

DATA
                                                       SIDEWAYS-STOPPING          FORWARD- STOPPING
 SNEAKER             STARTING FRICTION (N)                 FRICTION (N)              FRICTION (N)
     A                         6.3                              4.5                        4.8
     B                         4.6                              3.7                        3.6
     C                         4.4                              3.3                        3.4

Answer the following questions on your own paper. Use an appropriate heading and date.
  1. What is the manipulated variable? _______________________________________________
  2. What is the responding variable? ________________________________________________
  3. What are two controlled variables? ______________________________________________
  4. Do you think that using a sneaker with a small amount of mass in it is a fair test of the friction
     of the sneakers (vs. with YOUR mass in the shoe(s))? Why or why not? _________________

       ___________________________________________________________________________

      ___________________________________________________________________________
   5. Draw a labeled diagram (on the back of this paper) that shows the forces acting on the
      sneaker for each type of motion. (You’ll end up with three drawings of sneakers)
   6. Which sneaker had the most starting friction? ______________________________________
   7. Which sneaker had the most forward stopping friction? _______________________________
   8. Which sneaker had the most sideways stopping friction?______________________________
   9. Write a conclusion about the sneaker (A, B, C) and friction measurements. Include:
          Lowest data average
          Highest data average
          Comparative statement relating lowest and highest data average
          What was learned about the sneakers and friction

				
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