a friction experiment! newtons conceptual questions!

During an experiment,a crate is pulled along a rough horizontal surface by a constantforce and the magnitude of the acceleration along thex direction, , is measured. The vector has a component along the x direction ofmagnitude . The experiment is repeated several times, withdifferentvalues of each time.Part ACreate a plot of the force of staticfriction, , versus thex component of the pulling force, , for theexperiment. Let the point , along the horizontalaxis, represent the minimum forcerequired to accelerate the crate. Choose the graph that mostaccurately depicts the relationship among , , and .(Part A 1 figure)

 1)A2)B3)C4)D5)E

Part BCreate a plot of the force of kineticfriction, , versusthe x component of the pulling force, , for theexperiment. Let the point , along the horizontalaxis, represent the minimum forcerequired to accelerate the crate. Choose the graph that mostaccurately depicts the relationship among , , and .(Part B 1 figure)

1)A2)B3)C4)D
Part CAfter all the trials are completed, a graphof acceleration as a function of force is plotted. Assumingthe presence of both static andkinetic friction, which of the following graphs(Part C 1 figure)is most nearly correct?

1)A2)B3)C4)D