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# Determining the Static and Kinetic Friction of Wood Essay

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Another objective was to compute the measurement of the coefficient of kinetic friction between wood to wood and wood to Auber by measuring the time over which the block of wood is sliding down the plane and the length over which it slid. Using a ramp and a wooden block with two surfaces that were covered with rubber, the set up was prepared to start the first part of the experiment. The angle where the wooden block would start to slide was determined in a trial and error manner by five trials.

For coefficient of static friction, the angle of smaller area for wood to wood was 130 while the angle of larger area was 160. For wood to rubber, the angles for small and large area were 280 and 310 respectively. On the second part of the experiment, the set up was still the same like the first but the angles were higher. The results that were gathered were the acceleration and the time of the smaller area and larger area for wood as well as with rubber.

Overall, some factors affect the coefficient of friction like surface temperature and pressure and the weight and roughness of object. It was also concluded that the objectives of this experiment have been successfully met. INTRODUCTION Friction is thought to be the “evil” of all motion since they tend to exert force opposite the direction of a moving object, resulting to a slower velocity. Scientifically friction is define as the resistive force acting between bodies that tends to oppose the motion of an object, and thought to be perpendicular to the surface. 1] This force perpendicular to the surface of the object in motion or at rest is the normal force of the object that is the amount of contact force pushing the two surface at the same direction and that normal force is always equal and opposite to the weight of the object  This resistive force is mainly due to the roughness or the irregularity of friction usually produces heat since when two objects come in contact they tend to pub each other.

Another factor that affects the frictional force needed is the coefficient of friction and it is a measure of how an object is move that is how much force one should exert to move the object in a certain direction. Theoretically this coefficient of friction is proportional to the frictional force.

And there are two coefficients of fraction a certain object have and this are the coefficient of static friction and coefficient of kinetic friction that is defined as the ratio of frictional force to the normal force on the object. [l] and in order to an object to move one must overcome its coefficient of tactic friction, in short one must exert greater force compared to the weight of the object.

From Conical, an object at rest takes a larger force to get moved against the frictional force than to keep it moving In this experiment the group aim to compute the measurement of the coefficient of static friction and the coefficient of kinetic friction between wood to wood as well as wood to rubber METHODOLOGY In this experiment there are two parts of the procedure, first is the measurement of the coefficient of static friction and second is the measurement of the coefficient for the kinetic friction.

The friction of a ramp and the wood and also the ramp and rubber was determined. The materials used were a ramp and a wooden block with 2 surfaces covered with rubber. Figure 5. 1 Wooden Block With 2 Surfaces Covered With Rubber In measuring the coefficient of static friction (AS), the set-up was prepared. The ramp was placed in the table, then the wooden block was placed on the ramp. The angle were the wooden block would start to move or slide was determined by lifting the ramp in a trial and error manner. This was done for five trials.

The angle were the small area of the wooden block was determined first then next is the large area, next as the small area of the rubber surface and then last was the large area of the rubber surface. The coefficient of static friction was determined using the equation as = tang. Next part was determining the coefficient of static friction, a software device to measure friction that was being developed by some personnel of University of the Philippines Baggie was used. The length of the block was measured then the ramp was set to an angle greater than the critical angle of wood to wood measured in the first part of experiment.

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