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Static friction is the friction that tries to hold the object in position. A book positioned on a table has a static friction. The coefficient of static friction is denoted by µ. Dynamic friction is associated with the surfaces that in constant motion with each other. The friction force between the engine rotating parts is dynamic friction.
The major aim of the experiment is estimate the coefficient of static friction. It can be evaluated by pulling a box with known weight along a surface with smooth flat symmetry. The coefficient of static friction and normal force (FN) are correlated to each other when one surface starts to slide over the surface.
FF is the frictional force that is in opposite direction to the tension force. Force of gravity tries to pull the box down and normal pull force (FN) in opposite direction to the gravitational pull force. In this experiment we have to estimate the relationship between FN, FF and µ (coefficient of friction).
Friction of the object is directly proportional to the weight of the object; as the weight increase, the force of friction also increases. During the experiment, the box with more weight required more force to be pulled from its position. It means that the weight of the object increases its frictional value. On the other hand, comparatively less force is required pull the small box. This estimate can either be wrong as heavier weights require more force in general. Coefficient of friction also increases as the weight increases. We have estimated the ratio of FF and FN and found that as the weight of an object increases, the coefficient of friction also increases.
The other observation is that the surface area of the object in contact with the other surface also influences frictional force on the object. In our experiment, the box with more weight has more surface area in contact with the surface below and thus produced more friction. On the other hand, the object
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Data Table with
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