In the design of a new roller coaster, engineers must consider the coefficient of friction between the coaster wheels and the tracks. If the coefficient of static friction is 0.6 and the total weight of the roller coaster is 5000 N, what is the maximum force of static friction that can be exerted before the coaster starts to slide?

Static friction is the product of the friction coefficient and the normal force, which equals weight here. Other options are incorrect because Some think the friction force equals the weight itself; The error is assuming the coefficient multiplies the weight, then adds it.