{"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.\u003cbr\u003eProduct Type: Simple Machines\u003cbr\u003eRecommended Grade: Grade 4+\u003cbr\u003eRecommended Age: 9+ Years\u003cbr\u003e GRP:ERGO","brand":"Learning Advantage","offers":[{"title":"Default Title","offer_id":45519255994600,"sku":"er_CTU512","price":31.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0242\/5379\/2308\/products\/c66d4a41cde525780692d8b49cc500dcf3664229.jpg?v=1709124833","url":"https:\/\/www.shelhealth.com\/products\/simple-machines-block-tackle","provider":"ShelHealth","version":"1.0","type":"link"}