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.
Two surfaces meeting with motion between them. Friction is caused when the interlocking of 2 irregular â¦ surfaces comes in contact with. Friction is a force that slows things down or tries to stop an object moving. Friction causes grip and heat for example the brakes on your bike will be hot after they have slowed down the moving wheel. Without friction you feet would slip on the ground and the tires would slip and flip on the roads, and they both rely on friction to stay put.