Correct: Gravitational force is attractive force, Force unit is Newton in SI system, Force is a vector, The friction force acts in the opposite direction to the motion of the body., If the net force on the system is zero, then it is in equilibrium, Incorrect: Gravitational force is repulsive force, The dimensional formula for Force is: M0L1T-2, The friction force acts in the parallel direction to the motion of the body., Force can only be attractive, Force can only be repulsive,

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