gears and cogs system

abstract assemble assembling axles background backgrounds bright challenging classroom cogs colorful colourful colours components concept concepts conceptual connected connections diy education educational equipment experiment experimental experiments explore fun gear gears important instrument interconnected interesting interlocked interlocking items kid kids kit kits lab laboratory learn learning mate mates measure metaphor metaphors objects parts physic physical physics play process reaction reactions record related relationship round school science sciences scientific success system systems teach team teams teamwork teeth think together tool tools toy toys turn wheel wheels worker workers