friction shoe lab 2012.doc - Experimentally Determining Static Coefficients of Friction(Shoe Lab 30 points Purpose The purpose of this investigation is

# friction shoe lab 2012.doc - Experimentally Determining...

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Experimentally Determining Static Coefficients of Friction (Shoe Lab) 30 points Purpose: The purpose of this investigation is first to determine the coefficient of static friction for shoes; and second to compare the difference in friction of shoes on wet and dry surfaces. Every individual in the class needs to submit one of their shoes for this lab. Before the static coefficient of friction is calculated for the shoes, the class will predict which three shoes will have the greatest and which three shoes will have the least coefficient of static friction. This lab will be competed in groups of three. The requirements for the lab write-up are listed below. Materials: To complete this investigation each group will need the following materials: 3 different shoes protractor/ruler masking tape whiteboard/board of any kind of board water mister towels dry erase marker electric balance Procedure: Predictions – Each individual needs to pick one of their shoes to be used in the lab (either left or right.) BEFORE you do any experimenting predict which of your group’s shoes will have the highest dry µ s,max and highest wet µ s,max . Record these predictions in your data table. Also, predict which shoe will have the lowest dry µ s,max and highest wet µ s,max . Experimentation 1. Record in the data table each of the shoes that your group will use in this investigation. Include the brand of shoe and what kind of shoe it is (all purpose, flip-flop, high heel, basketball, tennis, moonboot etc.) 2. The whiteboards need to have a starting location clearly marked with tape so that every time the shoes start at the same spot. Place the toe of the shoe on the line while the board is horizontal. It is important that the entire shoe be on the board – you can place the shoes laterally on the board if need be. 3. One member of the group will SLOWLY raise the board and watch the shoe while the other two members will note the height of the board when the shoe starts to move and measure with protractors this angle. When the shoe JUST BEGINS TO SLIP record the angle of incline.

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