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With this book, kids will learn how screws work, where they're found, and their uses throughout history. They will learn that screws are simple machines that convert rotational motion into linear motion. A simple wood screw is made up of a metal shaft with a thread spiraled around it and a head with a groove in which a screwdriver can fit. When rotational motion is applied to the head of the screw, the screw converts the force to linear motion, which...
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"We can find levers all around us. Baseball bats, crowbars, seesaws, and wheelbarrows are all examples of levers. The three classes of levers make hard lifting jobs easier with the help of leverage. Each class of lever is set up differently, but has all the same parts. Levers are made up of a plank that pivots at a fulcrum. In this book, readers will learn about the difference between each class of lever, where levers can be found, and how levers...
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Inclined planes make difficult moving jobs much easier. They are used to move objects from a lower place to a higher place or vice versa without having to lift that object vertically. We can slide the object up or down the inclined plane to use less force. Inclined planes are all around us and have been used for thousands of years. In this book, readers will learn about the parts of an inclined plan, why they're beneficial, and where they can be found...
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"A wheel and axle is a disk and cylinder joined together. These two objects are only a simple machine when used in tandem. A wheel and axle is a modified first-class lever. When force is applied to the axle, the force is multiplied and transferred to the wheel. This causes the wheel to cover more area. In this book, readers will learn about the invention of the wheel and axle, where wheels and axles can be found, and how they make difficult jobs easier."--...
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"Pulleys make it easier to raise and lower heavy loads. We can find them all around us--on boats, bikes, flagpoles, and more! Pulleys are made up of an axle and a wheel with a groove around its edge. The grove keeps a rope, chain, or cable from slipping off the wheel. Pulleys come in a variety of sizes and materials and can either be fixed or moveable. When two or more pulleys work together, they're called compound pulleys. In this book, readers will...
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