Question

You are driving on the highway, and you come to a steep downhill section. As you roll down the hill, you take your foot off the gas pedal. You can ignore friction, but you can't ignore air resistance. Identify all the forces acting on the car?

Answer 1

Weight, air drag, normal.

Step-by-step explanation:

Since the car is only rolling downhill, the forces that will come into play are: it's own weight (the gravitational force the Earth exerts upon the car), the air resistance (the force the air exerts upon the car, since it says it can't be ignored) and finally the normal force (the contact force the ground exerts on the car). There are no other forces sources.