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Question 5.QA.3: A friction experiment A block is pulled along a horizontal s...

A friction experiment

A block is pulled along a horizontal surface (with friction) by a constant force with magnitude F_x, and the acceleration a_x is measured. The experiment is repeated several times with different values of F_x, and a graph of acceleration as a function of force is plotted. For the various trials, which of the graphs of acceleration versus force shown in Figure 5.14 is most nearly correct?

5.14
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No motion occurs unless the force F_x exceeds the maximum static-friction force; when it does, the block starts to move under the action of F_x and the smaller kinetic-friction force. Only answer A shows no acceleration at small values of the applied force.

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