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Our skateboarder illustrates the same physics we'll explore in the first two chapters of this book. Like someone who is skating (Section 1.1), he spends much of his time coasting forward because of his own inertia. But his recent trip up a ramp (Section 1.3) has lifted him high above the ground so that he is subject only to his weight-the downward pull of gravity-and travels in the arc of a falling ball (Section 1.2).
Of course, since both he and the board rotate like seesaws (Section 2.1) as they fall, landing safely is more than half the challenge. His concentration is a sure sign that he intends to ride the skateboard back down the slope on its friction-reducing wheels (Section 2.2) in another second or two. However, if he makes a mistake and collides with something, as he would in a bumper car(Section 2.3), it's Reassuring to note that he's warning a helmet.
If this all sounds rather ordinary, it's because physics is ordinary. It's everywhere you look. But understanding physics well will require some guidance and thought, so it's time to venture inside this book.
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