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In a laboratory experiment on friction, a 135-N block resting on a rough horizontal table is pulled by a horizontal wire. The pull gradually increases until the block begins to move and continues to increase thereafter. Figure 5.52 shows a graph of the friction force on this block as a function of the pull.(a) Identify the regions of the graph where static and kinetic friction occurs.(b) Find the coefficients of static and kinetic friction between the block and the table.(c) Why does the graph slant upward in the first part but then level out?(d) What would the graph look like if a 135-N brick were placed on the box and what would be the coefficients of friction be in that case?
In general, how does the coefficient of static friction compare to the coefficient of kinetic friction for the same two materials? Question 2 options: The coefficient of static friction can be less than or equal to the coefficient of kinetic friction. The coefficient of static friction is greater than the coefficient of kinetic friction. The coefficient of static friction can be greater than or equal to the coefficient of kinetic friction. The coefficient of static friction is equal to the coefficient of kinetic friction. The coefficient of static friction is less than the coefficient of kinetic friction.
To determine the coefficients of friction between rubber and various surfaces, a student uses a rubber eraser and an incline. In one experiment, the eraser begins to slip down the incline when the angle of inclination is 36.0o and then moves down the incline with constant speed when the angle is reduced to 30.0o. From these data, determine the coefficients of static and kinetic friction for this experiment.
