Place roast, flour, salt, and pepper in a ziplock bag.
Seal the bag and shake until the beef is coated.
Heat oil in a skillet over medium-high heat.
Remove beef from the bag and discard extra flour.
Sauté beef until browned, about 5 minutes.
Place the browned beef into the slow cooker.
Add onion soup mix, beef broth, tomato paste, and Worcestershire sauce.
Cook on LOW for 8 hours until beef is tender.
Add noodles to the slow cooker.
Cover and cook on LOW for 15-30 minutes until tender.