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CHAPTER 3 Simple Machines
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In this chapter we looked at many ways to make yourself stronger. The simple machines let you turn a long, easy push or pull into a short, yet powerful, force that can lift or move an object. All of the simple machines are based on this principle of mechanical advantage. The simplest machine is just a hill, or inclined plane. A portable inclined plane is a wedge. A spinning wedge is a screw. A di erent approach to mechanical advantage is given by the lever and by pulleys. Wheels, we learned, are like rotating levers and have their own force, torque, assigned to them. Gears and sprockets are toothed wheels that can be combined in large numbers to give a lot of mechanical advantage in a small space.
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1. If you wanted to study the forces acting on your robot when it is standing still, what would you study How about when it is in motion 2. What force is involved when you cut a sheet of paper with scissors When you crush a grape When you break a string 3. Remember that robot trying to climb a 10 degree hill As it is being pushed up the hill, how hard is gravity pulling against the push 4. What kind of lever is your knee a fulcrum of Your ankle 5. You have a gear with twenty- ve teeth, each of which takes 1/8 of an inch (eight teeth per inch). How big is your gear If you mesh it with a gear that has a 4.97 inch diameter, what is the mechanical advantage
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CHAPTER
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Introduction
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The study of electricity and electronics is the study of the electron and proton, the elds surrounding them, and how we a ect their behavior. The electron and proton are both charged particles, since they carry an electric charge. The electron is the key player in most electronics studies, since in metals it is the electron that moves around. A charged particle at rest has an electrical eld around it, radiating into space. A charged particle in motion generates a magnetic eld. These elds are normally studied together as the electromagnetic eld, since they are parts of the same thing. Electronics are the nervous system of the robot, replacing the mechanical gears and cams of the automata with wire and whizzing electrons. This chapter introduces you to the electrical and magnetic forces that are used in electronics. We ll try to keep it short and painless.
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CHAPTER 4 Electricity
Pieces of Matter
Everything is composed of atoms, which are little specks of matter. Atoms are themselves composed of a heavy core of neutrons and protons surrounded by a whirling cloud of lightweight electrons. And that is all a lie. In the early days, mankind looked around and saw that the world was made up of hundreds, thousands!, of things. Rock and sand and water and mildew and hair and skin and bugs and teeth and metal and wood and bark and leaves and re so many things! And of course, we gave everything names and thought up stories as to why these things were here and what they were for. At some point, philosophers and magicians and alchemists got to thinking about these things. What is wood made out of What if we took a piece of wood and chopped it into smaller and smaller pieces until we had the smallest possible piece of wood Is that piece still wood What does it mean to be wood At a later point in time, European alchemists would have said that the smallest pieces of everything were composed of the four elements Earth, Air, Fire, and Water. From China, the answer was more likely to be the ve elements Water, Fire, Metal, Earth, and Wood. A more detailed response says that the fundamental piece is the atom, which is simply Greek for can t be cut, and that there are a bunch of di erent types of atoms. These atoms can be assembled into molecules, which in turn are the building blocks of our daily stu . Chemistry comes to the front line now and de nes the behavior of the various atoms and molecules. We ultimately identi ed 116 atomic elements and organized them in the periodic table of elements according to their weights and behaviors. Brie y, in 1999, Berkeley Lab scientists thought they had found element number 118, but later retracted this claim. Elements 113, 115, and 117 are implied by the table but at this time remain undiscovered. At the atomic level, all matter is built up out of these elements and their variations. Life was good. We had atoms and we had mysterious forces like gravity and electromagnetism to keep things in place. Looking deeper, we were able to pry the atom apart into three pieces. Almost all of the atom s mass came from the heavy particles called neutrons and protons. Neutrons are neutral, in that they do not have any electromagnetic charge. Protons, however, have a positive charge. The neutrons and protons are bound together in the center, or nucleus, of the atom. Whizzing around this nucleus is an array of lightweight electrons. One electron has a negative charge equal to one proton, but it takes about
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