This month in Science, we learned about different ways of moving objects. Pulleys are used to move heavy loads with little effort. They are simple machines that have been used for thousands of years. We learned how they are made, how they are useful and we even made some working ones ourselves.<\/p>\n
Here are some things we learned about pulleys:<\/strong><\/em><\/p>\n Pulleys are simple machines designed to make life easier. They involve wheels that turn using a chain, rope or cable of some kind.<\/p>\n They work by pulling in a direction that is different from where the load being moved is going. By pulling down on the cable, the load goes up.<\/p>\n By pulling down on the rope, the load goes up.<\/p>\n \u00b7\u00a0Pulleys have been in use for thousands of years.<\/p>\n \u00b7\u00a0Modern pulleys use a wheel instead of a branch or a beam of wood. Thisis because there is less friction when a rope pulls over a wheel than when itpulls over a branch.<\/p>\n \u00b7\u00a0Pulleys often use more than one wheel.<\/p>\n \u00b7The more wheels in a pulley arrangement, the less force is needed to lift the same amount of material.<\/p>\n \u00b7\u00a0Pulleys are found in lifts, sash windows, cranes and some types of window blinds.<\/p>\n \u00b7\u00a0They are also found a lot in the work-place.<\/p>\n\n\t\t