Push - Moving something away from you., Pull - Bringing something closer to you., Friction - A force that slows things down when they rub together., Gravity - A force that pulls things down to the ground., Air Pressure - The weight of air pushing on things., Pneumatic Technology - Machines that use air to work (e.g., bicycle pump)., Force - A push or pull that makes something move or stop., Tug of War - A game that shows pulling and pushing forces., Index Card Experiment - Air pressure keeps water in the glass., Simple Machine - A tool that makes work easier (e.g., a lever or a pulley),

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