By Louis A. Bloomfield
This ebook makes use of widely used gadgets to introduce uncomplicated physics recommendations, demonstrating the thrill and relevance to execs in quite a few technical fields. simply because its constitution is outlined through real-life examples, this booklet explores suggestions as they're wanted after which revisits them in a while after they reappear in different items. It integrates case reviews in the course of the chapters to simply express an realizing and appreciation for physics. for instance, discussions of skating, falling balls, and bumper automobiles are incorporated to provide an explanation for the legislation of movement. Air conditioners and autos are used to discover thermodynamics. Engineers, architects, and execs in different technical fields will enjoy the fabric that connects technological know-how to our daily international.
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Extra resources for How Things Work: The Physics of Everyday Life (5th Edition)
Questions to Think About: How does a ramp make it possible for one person to lift a very heavy object? Why is lowering a heavy object so much easier than raising it? What changes about that object as you raise it? Why is a steep hill so much scarier to ski or sled down than a more gradual slope? Why is the steeper hill so much harder to bicycle up? Experiments to Do: Place a book on a slippery but level table or board. Hold the book steady for a second and then let go of it without pushing on it.
When you’re trying to summon up the courage to jump off the high dive, you want to know how long it’ll take you to reach the water and how fast you’ll be going when you hit. The first step in answering these questions is to look at how a ball’s velocity is related to the time you’ve been watching it fall. To do that, you’ll need to know the ball’s initial velocity—that is, its speed and direction at the moment you start watching it. If you drop the ball from rest, its initial velocity is zero. You can then describe the ball’s present velocity in terms of its initial velocity, its acceleration, and the time that has passed since you started watching it.
Although I will emphasize the SI system, English and customary units may give you a better intuitive feel for a particular physical quantity. A bullet train traveling “67 meters per second” doesn’t mean much to most of us, whereas one moving “150 miles per hour” (150 mph) or “240 kilometers per hour” (240 km/h) should elicit our well-deserved respect. 30480 m † The English units of force and mass are both called the pound. To distinguish these two units, it has become standard practice to identify them explicitly as pound-mass and pound-force.