Newton’s law is F = ma. If m is large, such as a loaded car, it is harder to accelerate and to stop.

 

Rolling wheels are stationary with respect to the road. Static friction holds the car on the road. When going around a curve, if the centripetal force is greater than the friction force, the car will slide. This means we have to go slower on curves that are wet. If the curve is sharp, if we do not slow down we can slide, for the same reason.