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.
For babies under 3 months, fever is urgent. If your baby is under 3 months old, your fever phobia is warranted. A temperature of 100.4 or higher in a baby this young is considered a medical emergency. Call your baby's doctor immediately, and make sure he or she understands that your baby is younger than 3 months. If medical advice is unavailable, go to the emergency room, even if it's the middle of the night.