sort the following quantities as known, to find, or unneeded. let m and v be the mass and speed of the car, respectively; μs is the coefficient of static friction, r is the radius of the circular path, n is the magnitude of the normal force acting on the car, and σfx is the x component of the net force acting on the car. A 1500-kg car drives at 30 m/s around a flatcircular track 300 m in diameter. What are the magnitude and direction of the net force on the car?