f(N) 75.0 - 50.0 25.0 PN) 25.0 50.0 75.0 100.0 125.0 150.0

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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 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? 

f(N)
75.0 -
50.0
25.0
PN)
25.0 50.0 75.0 100.0 125.0 150.0
Transcribed Image Text:f(N) 75.0 - 50.0 25.0 PN) 25.0 50.0 75.0 100.0 125.0 150.0
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