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                                    Which of these statements describe the correct properties of friction?A. Rolling friction is always greater than sliding friction.B. Friction acts in the opposite direction of relative motion.C. Friction causes the surfaces in contact to wear away.D. Friction produces heat energy. | 
                            
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Answer»  Which of these statements describe the correct properties of friction? A. Rolling friction is always greater than sliding friction. B. Friction acts in the opposite direction of relative motion. C. Friction causes the surfaces in contact to wear away. D. Friction produces heat energy.  | 
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