9. Which of the following statement is FALSE?, A. Friction occurs because the surface of any object is rough., B. Rougher surfaces create less friction., C. Greater force creates more friction., D. Friction is both harmful and helpful to you and the world around you., 10. Which shows that friction is useful?, A. Wheels of cars has jagged, B.Slides have smooth surface, g, D. Sport shoes have lesser spikes, C. Heavy cabinets have rollers, answer po please 25 points po