A ____ is a push or a pull. ____ are needed to change motion. ____ also called ____ forces cause velocity to change. ____ is speed in a given direction. A ____ with ____ will be harder to ____, meaning it will take ____ to get it moving, and once moving, it will be harder to stop or change direction compared to a marble with less mass; essentially, a marble with more mass will have ____ and ____ changes in its motion more significantly. A marble with ____ will be easier to accelerate because it will take less force to get it moving. A marble with little mass will have ____

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