The larger these peaks and valleys are, the harder it is to slide the object. You can learn more about friction in How Brakes Work. A clutch works because of friction between a clutch plate and a flywheel. We'll look at how these parts work together in the next section.
You should take children older than 3 months to the emergency room (ER) for a fever if the fever is more than 104 degrees for a long period of time. Ice them down first and then bring them to the ER.
Regardless of cause, call doctor if baby 12 weeks or younger has a fever of 100.4Â°F or higher (do not give fever medicine before being seen) or if older baby still has fever over 104Â°F two hours after fever medicine. Never give aspirin due to risk of Reye's syndrome.