The blame has been pinned, squarely and often, on inadequate oversight of U.S. financial institutions, which created ever more complex and risky mortgage instruments, lured people to buy homes they could not afford, and brought the economy crashing to the ground.
Motion on the Earth does not take place in a vacuum. When one thing moves, it moves through or across another. When a wheel turns on an axle, the two surfaces rub against one another. This is called dry friction. Grease can be used to separate the solid metal parts, but this just reduces the problem to layers within the grease sliding past one another.
What It Is. Tire cupping -- aka scalloping -- is a kind of tire wear consisting of regular divots or scoops carved out of the tire's tread.Depending on the location of the cupping, you may feel it as a vibration that increases with vehicle speed before you start seeing scoops of flat spots appear on the tire.iddle of the Tread. Scalloping can happen along the center of the tire's tread, or along one side. If it occurs down the middle of the tread, the cause usually goes back to the tire or suspension on that wheel regularly bouncing as it goes down the road.