A car travels on an unbanked circular curve at constant speed. All four of the car's tires roll without slipping. Ignore air resistance. Select all of the following forces that act on the car. Check all that apply a. Normal force b. Radial force c. Radial acceleration d. Static frictional force e. Kinetic frictional force f. Gravitational force

a. Normal force

b. Radial force

d. Static frictional force

f. Gravitational force

Explanation:

Static frictional force is opposite to the car's motion, keeping the car from slipping, since it is the only horizontal force acting on the car, the friction force  supplies the radial force which causes the uniform circular motion. Vertically, The gravitational force and its respective normal force acts on the car.