Elevators

Have you ever pushed the "up" or "down" button for an elevator? You probably stepped into the elevator car, pressed the number of a different floor in the building, and expected the door to open there-it happens millions of times all around the world every day! Most people don't ever consider all the engineering wonders behind this important transportation device. Just think: we would not have the skyscrapers and city skylines we have today without the modern elevator. Alignment, This book supports NGSS standards for engineering design, demonstrating how engineers define a design problem solvable through the development of an object, tool, process, or system while evaluating criteria for success and constraints on materials, time, or cost. Book jacket.