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Long Lab Report Physic
Kinetic Friction Experiment #13

Joe Solution E01234567 Partner- Jane Answers PHY 221 Lab Instructor- Nathaniel Franklin Wednesday, 11 AM-1 PM Lecture Instructor – Dr. Jacobs

Abstract The purpose of this experiment was to examine kinetic friction and what factors affect it. We pulled a wood block across a surface to determine whether the surface area of the block or the type of surface affects friction. The surface area did not appear to affect friction, since there was a small percent difference of 6.16% between different surface areas. The type of surface did as the difference in values was large, at 72.2%. (75 words)

Introduction The purpose of this experiment is to examine kinetic friction and the factors that affect it. The two factors that are examined within this experiment are the surface area of the object and the type of surfaces in contact with one another. Both of these will be tested and compared to see which affects the value of kinetic friction Friction is a force that always opposes the motion of an object. Friction can be divided into two different types. One is called static, and one is called kinetic. Static friction is a force between two objects that are not moving relative to one another. For example, an object resting on a slope, but not sliding down the slope, is kept in its position by static friction. Static friction must be overcome to cause an object to move across a surface. Once enough force has been applied to an object, it will begin to slide across a surface and kinetic friction will then act on the object. Kinetic friction occurs when two objects are moving relative to one another with one object sliding across the surface of the other and it opposes the motion of the object. Both types of friction are described by different coefficients. These values are known as the coefficients of static and kinetic friction respectively. The coefficient of static friction is usually higher than that of kinetic friction. A small wooden block

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