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Name:________________________ Per:______ Date: _______________ Shoe Lab Today you will be investigating the force of friction. There are two types of friction Static Friction: Kinetic Friction: Preliminary questions: 1) What do you think causes friction? 2) What types of materials have low friction? 3) What types of materials have high friction? You will be looking at two different situations. First, you will pull on the scale as much as possible without moving the shoe. 4) Draw a free body diagram labeling all of the forces on the shoe (gravity, support, pull, static friction) Is there a net force on the shoe? How do you know? Name:________________________ Per:______ Date: _______________ Next, you will pull the shoe along the ground at a constant velocity. 5) Draw a free body diagram labeling all of the forces on the shoe (gravity, support, pull, kinetic friction) Is there a net force on the shoe? How do you know? Experimental Design You will be testing your shoe on three different surfaces. Then you will be comparing you results with results of your other group members. Type of Shoe:___________________________________ Weight of Shoe:________________ Surface Tested Static Friction Kinetic Friction Type of Shoe:___________________________________ Weight of Shoe:________________ Surface Tested Static Friction Kinetic Friction Name:________________________ Per:______ Date: _______________ Type of Shoe:___________________________________ Weight of Shoe:________________ Surface Tested Static Friction Kinetic Friction Analysis 1) Which type of friction was highest, static or kinetic? 2) Which shoe had the highest friction value? 3) For the shoe you listed in #2, which surface had the highest friction value? 4) What factors affected the frictional forces? Name:________________________ Per:______ Date: _______________ Finding the coefficient of friction The coefficient of friction is a number which describes how strong friction is between two surfaces. It is represented by the symbol . f is the force of friction W is the weight of the object is a ratio that means we are comparing two values. In this case we are comparing two forces IS A NAKED NUMBER! It has no units. 1. Using the shoe with the highest friction value, calculate for both static and kinetic friction. 2. +The values for range from 0-1. The higher the number, the stronger the force of friction. Based on your data does your answer make sense? Explain why or why not.