I have a few questions related to downforce in cars. Please forgive any fundamental misunderstanding of aerodynamics. Does the shape of a car, say a Volkswagen Golf, driving on a road produce lift or downforce? Is the Coanda Effect at play there? How does the height of the car above the ground affect the lift or downforce? Assuming a car produces lift: Can the basic shape (i.e. airfoil) of the car be manipulated to produce downforce, perhaps by changing the angle of attack (e.g. lowering the front of the car)? When the air hits the front of the car, is it not redirected to a smaller area underneath the car, causing it to accelerate? Is this an example of the Venturi effect, causing downforce? Any clarification is much appreciated, thanks!