Grade 2 IB PYP How the world works - Simple Machines: Machines help us understand systems and design solutions through innovation. 23 Vocabulary words each with a picture, short definition and example sentence. Vocabulary words include: Machine, Function, Mechanic, Leverage, Pulley, Energy, Force, Movement, Load, Technology, Automate, Invention, Problem solve, Efficiency, Structure, System, Design, Materials, Observation, Procedure, Conclusion, Hypothesis and Outcome.