In this experiment, we test factors which affect friction. We pulled a wood block across a surface to determine whether surface area of the block orate type pokerfaced vasoconstriction. We found that the surface area of the block did not change the coefficient of kinetic friction, while the types of materials contact were directly related to the coefficient of kinetic friction. INTRODUCTION Friction is a part of our everyday life. Nearly every movement we make involves friction, and we have instinctively learned to take advantage of friction, or the jack of friction, since our childhood.
Simple devices that rely on friction are everywhere around us. This workshop will help you see and appreciate the role of friction. As we study friction, lets also think about the differences between what scientists do and what engineers do. In this experiment, we examined kinetic friction. We performed two tests see which physical properties affect kinetic friction. In the first part of the experiment, we determined if the surface area of a block affects coefficient of kinetic friction between two surfaces.
In the second part of the experiment, we determined that varying the materials between two sliding surfaces changes coefficient of kinetic friction between them. Finally, in both parts, we showed that friction depends on the normal force. OBJECTIVES 1. To determine the coefficient of friction p between contact surfaces as one body moves uniform motion. 2. To establish the relationship between angle of repose ˜ and p METHODOLOGY Determination of the coefficient of Friction. – Place the wooden plane horizontally. Measure the weight of the block. Slowly add weights in the pan until you observe a uniform sliding motion of the black.
Records the weight. Calculate for each trial and finally determine the average value. Determination of the Angle of Repose. – Remove the string that is tied to the block, facing its wider side, to the center of the plane’s figure. Measure the corresponding vertical height (h) and horizontal distance (b). Determination of Maximum Force that causes Uniform Motion. – Inclined the plane at an angle of 200. Add weights on the pan until uniform upward motion of the block is observe. RESULTS AND DISCUSSION Table 1 Table 2 Table 3 APPLICATION Making a fire using a stick and stone.