Rough surfaces create more friction than smooth surfaces. Thats why cars have tires. Its also why we use rubber mats in areas that might get wet. In your bathtub, you may even use No-Slip tape. No-slip is another way of saying the items has a lot of friction. In Figure 1.9, the blades of the skates are very smooth. Thats why you cant slide across ice with shoes. The soles of your shoes are much rougher than skates. The rougher surface of shoes causes more friction and slows you down. Heavier objects also have more friction. A heavy object presses down with more force. The surfaces are held together more tightly. This makes the surfaces harder to slide past each other. Did you ever try to push something heavy across the floor? Heavy objects are much harder to push than light objects.
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QUESTION: Why do cars have tires?

Dr. Benjamin Stone is a hotshot young surgeon who longs to leave the drudgery of a Washington , D.C. emergency room and finally leaps at his chance at more money and less death as a plastic surgeon in Beverly Hills . On his last day , Ben's relationship with his co-workers is presumed to be anything but a warm one . None of his colleagues will join him for a drink and a cake in his honor has an iced portion of the phrase '' Good riddance , asshole '' sliced out . Ben's cross-country drive in a 1956 Porsche 356 Speedster is interrupted when he crashes in the rural hamlet of Grady , South Carolina . The crash damages the fence of local Judge Evans , who sentences him to community service at a nearby hospital . Ben offers to pay for the fence , but the stern judge increases his community service each time he talks back . Defeated , he reports to the hospital , where Nurse Packer humbles him by ordering him to clock in and out , as would a factory worker . Though upset , Ben quickly makes friends with Mayor Nick Nicholson , the town cafe's proprietor/head waitress , and Melvin , the local mechanic tasked with repairing Ben's car . Ben soon finds his clinic work to be much more laid-back than the emergency room . He has simple cases such as spots before the eyes , fishing hook impalings , and even reading mail for a young illiterate couple , whose baby he later delivers . The experience also humbles Ben when he mistreats a case of mitral valve regurgitation leading to late cyanosis in the child .
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QUESTION: Which car was Melvin supposed to repair?

The Finnish government and major creditors of bankrupt shipyard Waertsilae Marine Industries Oy agreed in principle to form a new company to complete most of the troubled shipyard's backlog of 15 ships. The new company will attempt to limit the shipyard's losses, participants said. "The situation is that the bankruptcy court will get out of the shipbuilding business. Everything will be taken over by the new company," said Christian Andersson, executive vice president of Oy Waertsilae, former parent of Waertsilae Marine. Once its ownership is finalized, the new company will open talks with state-appointed receivers to buy or lease Waertsilae Marine's shipyard facilities. Subcontractors will be offered a settlement and a swift transition to new management is expected to avert an exodus of skilled workers from Waertsilae Marine's two big shipyards, government officials said. Under an accord signed yesterday, the government and Union Bank of Finland would become major shareholders in the new company, each injecting 100 million Finnish markkaa ($23.5 million). Oy Waertsilae is to contribute 200 million markkaa, most of it as subordinated debt, and take a minority stake in the new company. Customers holding contracts for Waertsilae Marine's undelivered ships are expected to subscribe most of the remaining 170 million markkaa in share capital, government officials said. Waertsilae Marine's biggest creditor is Miami-based Carnival Cruise Lines Inc. Carnival, which has three ships on order from Waertsilae Marine, presented claims for $1.5 billion damages in the bankruptcy court this week. Waertsilae Marine's bankruptcy proceedings began Tuesday in a Helsinki court.
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QUESTION: How much money will the new shareholders invest in the new company?

Earths magnetic field helps protect Earth and its organisms. It protects us from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles. This is where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole. Knowing this helps them tell direction. Many animals have natural 'compasses' that work just as well. Birds like the garden warbler in Figure 1.36 use Earths magnetic field. They use it to guide their annual migrations. Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern.
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QUESTION:
Where is Earths magnetic field strongest?