1. The problem statement, all variables and given/known data Hi. I'm not a student, and I'm old, so I don't remember physics class in high school. So I apologize for my question. I'm trying to figure out how you would translate aerodynamic drag to someone like me- a layman. I have a wing on my car that, if I were to tilt it to 25 degrees angle of attack, would produce 120 pounds of downforce at 70mph, but would also produce 48 pounds of drag. I was trying to explain the problem of drag to a good friend, and I'm having trouble equating that to something he can appreciate. If I'm thinking correctly, this 48 pounds of drag would be like attaching a rope on the back of the car and dragging a 300 pound chunk of steel down the road since the drag from friction would be about 48 pounds. But how do I determine exaclty how much a chunk of steel must weigh to equal 48 pounds of friction drag? I assume that contact surface would be a determining factor aslo. Thanks for your help!