{"product_id":"simple-machines-block-tackle","title":"Simple Machines Block \u0026 Tackle","description":"One pulley can be used to change the direction of the force applied by a cord several pulleys can be used to make this simple machine. A small force on the cord can be used to lift a large weight. Experimenting with the device shows why: lifting the block by a short distance requires that the cord be pulled a long distance. This classic wooden model offers children a basic concept of the laws of physics. Desktop sized.","brand":"Learning Advantage®","offers":[{"title":"Default Title","offer_id":43701918662730,"sku":"CTU512","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0582\/1146\/7338\/files\/309640765.jpg?v=1781437266","url":"https:\/\/checkout.inspire.world\/es\/products\/simple-machines-block-tackle","provider":"Inspire World","version":"1.0","type":"link"}