True: Frictional force is always opposite the movement direction, Frictional force is the force produced when 2 surfaces are in contact with one another, Mass of an object affect frictional force, Type of surface affect frictional force, Frictional force has advantages and disadvantages, False: Frictional force is always same direction with the movement direction, Frictional force is the force produced when 2 surfaces are not in contact with one another, Mass of an object does not affect frictional force, Type of surface does not affect frictional force, Frictional force only has disadvantages,

Frictional force

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