In the free-body diagram, the friction force opposes the applied force of dragging the box.
What is free body diagram ?
"A free body diagram is the diagrammatic representation of a body that is isolated from the surroundings showing all the external forces surrounding it."
What is friction force ?
"Force that resists the sliding or rolling of one solid object over another. Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion."
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