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In a laboratory experiment on friction, a 135-N block
Chapter 8, Problem 26E(choose chapter or problem)
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 E5.26 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 friction and kinetic friction occur.
(b) Find the coefficients of static friction and kinetic friction between the block and the table.
(c) Why does the graph slant upward at first but then level out?
(d) What would the graph look like if a 135-N brick were placed on the block, and what would the coefficients of friction be?
Questions & Answers
QUESTION:
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 E5.26 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 friction and kinetic friction occur.
(b) Find the coefficients of static friction and kinetic friction between the block and the table.
(c) Why does the graph slant upward at first but then level out?
(d) What would the graph look like if a 135-N brick were placed on the block, and what would the coefficients of friction be?
ANSWER:Step 1 of 3
The weight of the block is, .
Where N is the normal reaction and also defined as weight.
a)
In the graph at the point (75,75) static friction occurs and at the point (75,50) kinetic friction takes place.