force, a push or a pull applied to an object., gravity, an invisible pulling force that keeps our feet on the ground and everything from floating away into space, push, a force that moves an object away., pull, a force that moves an object towards., air resistance, an invisible "pushing" force that slows things down as they move through the air., magnet, an object that can pull (attract) or push (repel) certain types of metals, community, a group of people who live in the same area, share the same interests, or work together to help each other, vibration, a quick shaking or wiggling movement back and forth, component, a single part that combines with other pieces to make something bigger, prototype, an early, test version of a new invention, toy, or product, solution, an answer to a problem or puzzle., permanent, something that is meant to last for a very long time, or even forever, material, what an object is made of. , friction , an invisible pushing force that happens when two surfaces rub against each other..

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