In a laboratory experiment on friction, a 127-N block resting on a rough horizon

Question

In a laboratory experiment on friction, a 127-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. The figure (Figure 1) shows a graph of the friction force on this block as a function of the pull.

A. Find the coefficients of static and kinetic friction between the block and the table.

B. Why does the graph slant upward in the first part but then level out?

C. What would the graph look like if a 127N brick were placed on the box, and what would be the coefficients of friction be in that case?

Explanation / Answer

The question cannot be solved unless you provide the following data.

1. The external force (F) acting on the block when the block just starts to move. This is required to determine the coefficient of static friction (??).

F = ?? mg

2. The acceleration (a) with which the block moves after the block started moving. This is required to determine coefficient of kinetic friction (??).

F - ?? mg = ma

I think I at least gave a clue how to solve the question.

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