A brick is sliding to the right on a horizontal surface. What are the directions of the two surface forces: the friction force and the normal force?These videos are part of a unit of instruction created by NJCTL. Students and teachers can find additional free instruction on this topic at the site listed below. This includes the full unit presentation, homework with solutions, and assessments (teachers only).Dynamics Presentation - http://njctl.org/courses/science/algebra-based-physics/dynamics/dynamics-presentation-4/
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