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Physics in Everyday Life

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Physics in Everyday Life

A boulder sits on a mountainside for a thousand years. The boulder will remain there forever unless an outside force intervenes. Suppose a force does affect the boulder--an earthquake, for instance. Once the boulder begins to thunder down the mountain, it will remain in motion and head in one direction only downhill, until another force interrupts its progress. If the boulder tumbles into a gorge, it will finally come to rest as gravity anchors it to the earth once more. In both cases, the boulder is exhibiting the physical principle of inertia: the tendency of matter to remain at rest or, if moving, to keep moving in one direction unless affected by an outside force. Inertia, an important factor in the world of physics, also plays a crucial role in the human world. Inertia affects our individual lives as well as the direction taken by society as a whole.

Inertia often influences our value systems and personal growth. Inertia is at work, for example, when people cling to certain behaviors and views. Like the boulder firmly fixed to the mountain, most people are set in their ways. Without thinking, they vote Republican or Democrat because they have always voted that way. They regard with suspicion a couple no children, simply because everyone else in the neighborhood has a large family. It is only when an outside force--a jolt of some sorts occurs that people change their views. A white American couple may think little about racial discrimination, for instance, until they adopt an Asian child and must comfort her when classmates tease her because she looks different. Parents may consider promiscuous any unmarried teenage girl who has a baby until their seventeen-year-old honor student confesses that she is pregnant. Personal jolts like these forces people to think, perhaps for the first time, about issues that affect them directly.

To illustrate how inertia governs our lives, it is helpful to compare the world of television with real life. On TV, inertia does not exist. Television shows and commercials show people making all kinds of drastic changes. They switch brands of coffee or try a new hair color with no hesitation. In one car commercial, an ambitious young accountant abandons her career with a flourish and is seen driving off into the sunset as she heads for a small cabin by the sea to write poetry. In a soap opera, a character may progress from homemaker to hooker to nun in a single year. But in real life, inertia rules. People tend to stay where they are, to keep their jobs, to be loyal to products. A second major difference between television and real life is that on television, everyone takes prompt and dramatic action to solve problems. The construction worker with a thudding headache is pain-free at the end of the sixty second commercial; the police catch the murderer within an hour; the family learns to cope with

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