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Author
Description
We can find levers all around us. Baseball bats, crowbars, seesaws, and wheelbarrows are all examples of levers. The three classes of levers make difficult 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. Readers will learn about the difference between each class of lever, where levers can be found, and how levers make many...
Author
Description
Pulleys make it easier to raise and lower heavy loads. We can find them all around us, on boats, bikes, flagpoles, and many more places. 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. Readers will...
Author
Description
A wedge is two inclined planes joined together. When joined, the inclined planes form a sharp edge. Inclined planes are stationary objects, whereas wedges are active objects. When force is applied to the flat side of the wedge opposite the sharp edge, parts of the object become separated. For example, an ax is a metal wedge that splits a piece of wood apart. Readers will be provided with a number of examples of wedges, where they're found, and the...
Author
Description
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. Readers will learn about the parts of an inclined plane, why they're beneficial, and where they can be found in our everyday...
Author
Description
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. 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.
Author
Description
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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