The coefficient of friction between a car and dry pavement is approximately 0.7, but the coefficient on wet pavement is 0.4 or less. What does this indicate about driving on wet pavement? A) A car's normal force is less on wet pavement. B) A car's normal force is greater on wet pavement. C) A car requires less applied force to move on wet pavement. D) A car requires more applied force to move on wet pavement.

D) A car requires more applied force to move on wet pavement

Explanation:

The coefficient of friction determines the frictional force that the ground applies on the car .

Maximum force of friction generated = μ R where μ is coefficient of friction and R is reaction force of the ground

Reaction force of the ground = mg or weight of the car . Since weight is same on dry and wet ground so normal force will be same is both the case .

Force of friction generated in respect of dry pavement will be more because of greater coefficient of friction .

Friction force helps in driving a car in forward direction hence it is easy to drive car on dry pavement . On wet pavement , it will slip off at the same place rather than move forward .

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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