{"product_id":"zart-pull-back-racer-modelling-bases-pack-of-20-4-5-x-5cm-plastic-chassis","title":"Zart Pull Back Racer Modelling Bases Pack of 20 4.5 x 5cm Plastic Chassis","description":"\u003ch2\u003eThe model moves, which changes what students build\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e20 plastic chassis bases. 4.5 x 5cm. Built-in pull-back mechanism. $28.30 - $1.42 each.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA model that moves gets tested.\u003c\/strong\u003e A static model gets made once and looked at; a racer gets pulled back, released, and immediately compared against everyone else's - which means students iterate without being asked to. That is the entire argument for these.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe STEAM content is real, not decorative.\u003c\/strong\u003e Add weight and it slows; put the mass too high and it tips; make it too tall and it is unstable. Force, motion, weight, balance and centre of gravity all show up as consequences a child can see rather than facts they are told.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e4.5 x 5cm is deliberately small\u003c\/strong\u003e, so a model is built in a lesson rather than a term, and twenty fit in a tub.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuild anything on top\u003c\/strong\u003e - a car, a creature, a character, a Christmas thing. The base does not dictate what goes above it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTwenty at $1.42\u003c\/strong\u003e is a class set, so everyone races rather than watching a demonstration.\u003c\/p\u003e\u003ch2\u003eTwo things to know\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eZart does not publish an age rating\u003c\/strong\u003e, and these are small plastic parts with a wound spring mechanism inside. \u003cstrong\u003eFor early years, supervise\u003c\/strong\u003e - and tell us if you need a formal rating, we will ask.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThey also do not say how much weight the mechanism will pull.\u003c\/strong\u003e That decides how elaborate a model can get before it stops moving, so \u003cstrong\u003ewe have asked.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Zart","offers":[{"title":"Default Title","offer_id":53793513931115,"sku":"EVWPZ090","price":28.3,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/2795\/8891\/files\/WPZ090_EG1.jpg?v=1788376554","url":"https:\/\/megaofficesupplies.com.au\/products\/zart-pull-back-racer-modelling-bases-pack-of-20-4-5-x-5cm-plastic-chassis","provider":"Mega Office Supplies","version":"1.0","type":"link"}