Question

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.

Answer 1

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

Step-by-step 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 .