LIFTS

Although the lifts we ride in today are ……………………........… (1), technological devices, the concept behind the lift has been around for thousands of years. Ancient people who constructed buildings realized the need for a way to move people and objects from one level to another. For example, ……………………........… (2) Roman architect Vitruvius wrote about Archimedes building a lift-like device almost as early as 236 B.C. Today's modern lifts, just like those ancıent ones, work like a pulley. The lift car that you ride in has a …………………........… (3) metal cable attached to the top of it and that cable runs up the lift shaft. A powerful motor attached to the sheave can turn the wheel to move the car up or down. The lift buttons you push tell the lift's computer system where ……................……........… (4) need to be picked up and where they need to go. Sophisticated computer algorithms are used to make the lift system work ……………………........… (5). We use lifts to get to the top of ……………………........… (6) buildings. Some scientists believe that one day they will be used to go into space. What do you think? Will you see a working space lift in your lifetime?

Adapted from wonderopolis.org