During an experiment, a crate is pulled along a rough horizontal surface by a constant force F_vec and the magnitude of the acceleration along the x direction, a_x, is measured. View Figure The vector F_vec has a component along the x direction of magnitude F_x. The experiment is repeated several times, with different values of F_x each time.(adsbygoogle = window.adsbygoogle || []).push({});

Create a plot of the force of static friction, f_s, versus the x component of the pulling force, F_x, for the experiment. Let the point F_min, along the horizontal axis, represent the minimum force required to accelerate the crate. Choose the graph that most accurately depicts the relationship among f_s, F_x, and F_min.

Create a plot of the force of kinetic friction, f_k, versus the x component of the pulling force, F_x, for the experiment. Let the point F_min, along the horizontal axis, represent the minimum force required to accelerate the crate. Choose the graph that most accurately depicts the relationship among f_k, F_x, and F_min.

After all the trials are completed, a graph of acceleration a_x as a function of force F_x is plotted. Assuming the presence of both static and kinetic friction, which of the following graphs View Figure is most nearly correct?

I am too sure about these questions, but so far I have guessed.

For the first one, I am thinking it is D, because the static friction to overcome is needed only for few seconds.

For the second one, I am thinking it is D because force of kinetic is required after a few seconds.

For the third one, I think it is B because the force applied must be equal to or greater than the force of friction for the block to move.

Please comment on my answers, I am not too sure about them.

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# A Friction Experiment

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