When a car brakes hard and skids, the maximum deceleration is 6 m/s2. The coefficient of friction between tires and road is _____.

A 75 lb horizontal force is exerted on a 150 lb rested chair. The coefficient of static friction between the chair and the floor is 0.55. Determine the static frictional force action on the chair.   A horizontal force is exerted on a 150 lb rested chair. the coefficient of static friction between the chair and the floor is 0.55. Determine the maximum horizontal force that can be applied to the chair before it moves.

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أجب على جميع الأسئلة * A coefficient of friction greater than one means tha? 1-0ther than 0 2_the frictional force is equal to the normal force 3-The friction force is stronger than the normal force 4-The normal force is stronger than the frictional force *: The force of friction depends on? 1-other than them 2-coefficient of friction 3-normal reaction 4-normal reaction The amount of friction reduction depends on the nature and condition of the polishing. The two contact surfaces? 1-other than them 2-The area and shape of the two contact surfaces 3-The nature and condition of the polishing of the two contact surfaces 4-every one of them