1Place potatoes in 3 1/2- to 4-quart slow cooker. Coat beef with flour; place on potatoes. Arrange carrots around beef. Pour salsa over all.
2Cover and cook on low heat setting 8 to 10 hours.
3Remove beef from cooker; place on cutting board. Pull beef into serving pieces, using 2 forks. To serve, spoon sauce over beef and vegetables.