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A car's performance is tested on various horizontal road surfaces. The brakes are applied, causing the rubber tires of the car to slide along the road without rolling. The tires encounter the greatest force of friction to stop the car on: A) dry concrete, B) dry asphalt, C) wet concrete, D) wet asphalt. (Hint: check your reference table!!!)
A, to obtain the greatest force of friction, we'll need the greatest coefficient of friction (mu). Since the tires are sliding, we need the kinetic coefficient of friction.