A force, Fapplied, is used to pull a block of mass m up an incline plane for which friction is present. The force is gradually decreased with time, as shown in the graph above. At some point the block starts to slide down the incline plane under the influence of its self weight. Which of the graphs below best shows the magnitude and direction of the friction force, FFriction, exerted on the block?

A force, Fapplied, is used to pull a block of mass m up an incline plane for which friction is present. The force is gradually decreased with time, as shown in the graph above. At some point the block starts to slide down the incline plane under the influence of its self weight. Which of the graphs below best shows the magnitude and direction of the friction force, FFriction, exerted on the block?

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