Whether it is for a school project or to help you with moving things in your house, a pulley is a great gadget that has been around for centuries. Put your mechanical abilities to use and create your own pulley. Step 1 Determine the strength and size of the wheel or spool and cord yo...
T hekey was to use a pulley system that would magnify the applied force. So they rigged up atent-shaped scaffold(支架)directly above thetip of the horizontal column, with pulleys(滑轮)suspended from the scaffolds aper(顶点).The idea was that as one end of the column rose, the base ...
Photo: A pulley mounted on a huge lifting frame to make it safer to use. Thanks to the power of pulleys, one person can lift far more than their own weight without straining any muscles, because several ropes or chains support the extra weight. Photo by Charles D. Gaddis IV courtesy of...
If you want to lift a really heavy weight, there’s only so much force your muscles can supply, even if you are the world’s strongest person. But use a simple machine like a pulley to multiply the force your body produces. The object lifted by a pulley is called the load. The forc...
While using only one pulley requires you to use the same force it would take to lift a load by hand, a fixed pulley combined in a system with a movable pulley, essentially doubles the force applied to lift or move the object. For example, if you have an object that weighs 100 N, al...
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Next, attach the clothesline tightener to the end of the line using the correct attachment method. There are two common methods: a ratchet strap or a pulley system. To use the ratchet strap, simply tighten the strap until it’s snug against the post or tree. Be sure to keep the tension...
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The conveying means comprise a frame, at least one pulley means which is rotatably connected to the frame about a vertical axis of rotation, an endless flexible conveying element which is passed over said at least one pulley means, a guide extending along a conveying path, and hooks for the...