A car is a height of 1.6 meters and width of 2 meters. (the length is immaterial). The following is an actual excerpt from the manufacturers specifications:  Fuel capacity: 51 liters/ 13.5 US gal/ 11.2 gal Drag coefficient 0.42 (at highway speed) a) If I am driving at 100 km/hr through air what is the drag force on the car. Note this is the same as if the car were stationary in at 100 km/hr wind. Air density is 1.2 kg/m^3 viscosity is 0.018 cp

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.