# Lab 6 - Friction Lab PHYS 2125 102 Abstract The purpose of...

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Friction Lab PHYS 2125 – 102 Abstract: The purpose of this experiment was to explore the force of friction and the different types of friction that are present in different experimental situations. First, we examined the friction of a block against a surface at a 0°, and next we investigated the friction on the same block at an angle using an inclined plane. Both techniques helped us successfully verify the types of friction and the difference between the two. Theory: Friction is defined as the resistance between two objects when their surfaces touch. This is usually described as an object moving or resting on a surface. There are two different forms of friction that we learned about. The first type of friction is static friction, which is the type of friction that is described by nonmoving objects. Once an object has overcome the force of static friction, and the object starts to move, this is when kinetic friction becomes present. This kinetic friction is the second type of friction. The quantity of kinetic friction is generally less than the force of static friction, as well the force of static friction is commonly equal to or larger than 0. The force of static friction is described by the equation fs μsN , where fs is the force of friction, μs is the coefficient of static friction, and N is the normal force. Kinetic friction can be found using the equation = fk μkN , where fk is the force of friction, μk is the coefficient of kinetic friction, and N is the formal force. In either of these equations the term coefficient of friction describes the ratio of force of friction between two objects. This is value is dependent on the type of material on the two surfaces. The normal force is the force of the surface an object is resting

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or moving on, resisting the object. For example, if a book is sitting on a table, the force of the table pushing up on an object is the normal force. This force is always perpendicular to the surface. In the first part of the experiment, when the block is against a surface at 0°, the normal force can be described by the equation = N mAg , where m A is the total mass of the block and the masses on the block, and g is the force of gravity which in this experiment is the constant 9.79 ms2 . The block is sitting on a surface that is tied to a hanging mass which is the force of tension to which the force of friction is opposing. This tension force is identified by the formula = T mhg , where m h is the total mass of the hanger. There for the force being applied on the block is , = μs maxN T . When substituting the formulas we have learned for the force of tension and the normal force the equation is derived to be , = . μs maxmAg mhg Because the gravity’s are
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## This note was uploaded on 04/14/2008 for the course PHYS 2125 taught by Professor Macalevey during the Fall '07 term at University of Texas at Dallas, Richardson.

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Lab 6 - Friction Lab PHYS 2125 102 Abstract The purpose of...

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