{"product_id":"metal-pulley-single","title":"Metal Pulley Single","description":"\u003ch2\u003eOne pulley, metal framed, hooks at both ends - $5.40\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eMetal frame, plastic wheel, metal hook at each end. Sold individually.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA single pulley changes the direction of a force without changing its size, and that is the first thing a class needs to see before anything else about mechanical advantage makes sense. Pull down, the load goes up, and the effort is the same as the load.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHooks at both ends\u003c\/strong\u003e is the detail that makes it work in a classroom. One hooks to a stand or a beam, the other takes the load - or another pulley, which is how you build a two-pulley system and halve the effort.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMetal frame, plastic wheel.\u003c\/strong\u003e The frame is the part that gets dropped and bent, so metal there is right. The plastic wheel runs quietly and does not corrode.\u003c\/p\u003e\u003cp\u003eSold singly, which is how pulley work should be bought: start with one to show direction change, add a second for mechanical advantage, add more for a block and tackle. At $5.40 a class can build systems rather than watch one.\u003c\/p\u003e\u003cp\u003eUse it with the slotted weights and a hanger, a stand and clamp, and a spring balance to read the effort. All sold separately.\u003c\/p\u003e","brand":"MTA Essentials","offers":[{"title":"Default Title","offer_id":53793089749355,"sku":"EVNK50930","price":5.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/2795\/8891\/files\/nk50930_pulley-metal-8211-single-black-plastic-wheel-8211-each.webp?v=1788359122","url":"https:\/\/megaofficesupplies.com.au\/products\/metal-pulley-single","provider":"Mega Office Supplies","version":"1.0","type":"link"}