system of interconnected gears

abstract abstracts assemble axles background backgrounds bright classroom cog cogs colorful coloured colourful colours components concepts conceptual connected connections diy educational equipment experiment experimental experiments explore fun gear gears great green instrument inter interesting interlock interlocked interlocking items kid kids kit kits laboratory labs learn learning link linked linking mate mates metaphor metaphoric metaphors objects parts physic physical physics play process reaction related relationship round school science sciences scientific success successful system systems teach team teammates teamwork teeth think thinking three together tool tools toy toys turn turning two wheel wheels yellow young