The measure of the force of gravity on an object is weight.
Weight is different from mass!!!
Mass vs. Weight Scale Balance Measuring Tool Changed by location Newton (N) Amount of gravitational force acting on an object Weight Not changed by location g, kg The amount of matter in an object Mass Location Unit Definition
When a car goes around a sharp curve the centripetal force is the friction between the tires and the road.
Although, if the road is icy, the tires may lose their grip. The amount of centripetal force will not be enough to overcome the car’s inertia.
So the car would continue to move in a straight line.
As the moon orbits the Earth, the force of gravity acting upon the moon provides the centripetal force required for circular motion. As a bucket of water is tied to a string and spun in a circle, the force of tension acting upon the bucket provides the centripetal force required for circular motion. As a car makes a turn, the force of friction acting upon the turned wheels of the car provide the centripetal force required for circular motion.