Friction Lab - Lab 6 Conclusion PDF

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Lab 6 Conclusion...

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The underlying purpose of this lab to was to determine the relationship that existed between the force of friction and the normal force of a slide block. I thought that the relationship between those two forces would be inversely related. However, the data said otherwise. The data showed that the two forces are directly related. This was throughout our data collection process because as we increased the normal force on the wooden block, the frictional force increased proportionally. Now I will talk about the slope. Since the slope of our lab was a force over a force, the unit of Newton was eliminated and that left us with a ratio of frictional force to normal force. This ratio is specialized to two objects interacting, creating friction. But when we slid the block on the cloth, we got a different ratio. The ratio is noted as the coefficient of friction. The coefficient is assigned to a pair of materials not just one material. Also written as μ . A unit-less ration between normal and frictional force that differs among objects. The math model for this experiment is Force of Friction = .54 * Force Normal - 1.04. The math model tells us a couple of things. First off, we know that the kinetic µ of the block on the table is .54. Secondary, due to the fact that we have a y-intercept which means that there were mistakes committed and that there was inconsistency in data accumulation. We know that there should not be a y-intercept because if the normal force is 0N then friction must be 0N as well, as the materials are not interacting against each other which leads to no friction. But having a yintercept, in essence means that the objects are not touching each other but still have friction. An example of a possible error could be that the person pulling the block across the surface was not moving the block in a constant velocity. Therefore, making the data inconsistent. In this lab there is two math models. That was the math model for the felt table. Now I will add the math model for the block moving on the mini rug. The math model will be Force of Friction = .41 *

Force Normal + 1.025. The kinetic µ of the bock on the rug is .41. Y-intercept for this particular part of the experiment was 1.025. Like I explained earlier, this is caused by having some error and collecting data inconsistently. After figuring out the math model and understanding slope and y-intercept, we were able to identify the general formula for frictional force. The general formula for this lab is Force of Friction = µ * Force Normal. In words, if you take the normal force of an object and multiply it by the coefficient of friction between the two objects (surfaces) interacting, you will be able to find the force of friction on the object. Some examples of this formula being used in real would include geese sliding on ice, tires on concrete, and a person pushing a couch with legs across the floor to the other side of the room. Some new vocab includes the Force of Friction. Friction is a force that is created whenever two surfaces move or try to move across each other. Friction always opposes the motion or attempted motion of one surface across another surface. Force normal is the support force exerted upon an object that is in contact with another stable object, and is always perpendicular to the surface. Kinetic Friction is also known as sliding friction, and is the amount of force between two objects that are moving relative to each other. Lastly I would like to add that were testing the kinetic friction by moving the block, therefore meaning that we weren’t measuring the static friction....