A jet plane is speeding down the runway during takeoff. Air resistance is not negligible. Identify the forces on the jet.

Video transcript

Hey, everyone in this problem, we have a car accelerating on a flat surface. We're told that air drag is a significant force. We're also told to assume that the wheels roll without slipping. And we're asked to list all the forces acting on the car. Now, when we think about a car, can everything about any object, we know we have the force of gravity acting on it. Ok. So among our five answer choices, which are listed as A through E each of them has the force of gravity included and we know that that's gonna be there. Now, the next thing is that this car is gonna be on a surface. They were told that the car is on a flat surface and that tells us that there's gonna be a normal force act. Ok? So option A Ed and E all have a normal force included. Option C does not. So we're gonna eliminate option C right now because we know that there is a normal force. Now, next, in this problem, we're told that drag is a significant force. And so we need to consider drag and we need to include it in our list of forces. So option A option B and option D include DR option E does not. So we're gonna eliminate option E and we're down to three options now. Ok. Now the difference in these three options, option A has no friction. Option B has kinetic friction and option D has static friction. Now, these wheels are rolling without slipping. Ok? When we hear wheels rolling without slipping, what that means is there is friction acting on that wheel in order to allow it not to slip. Ok. So we can eliminate a, we know that we have friction. The question is whether it is kinetic or sa now because this friction stops the wheel from slipping. Ok. That means that we're gonna have static friction whenever you have wheels rolling without slipping, think static friction. OK. So the correct answer here is gonna be option D we have the weight or the force of gravity acting, we have a normal force because we're on a surface. We have drag and we also have this static friction force because we are rolling without slipping. That's it for this one. Thanks everyone for watching. See you in the next video.