Gravity - Pulls objects toward the Earth, Friction - Slows objects down or stops them, Air resistance - Pushes against objects moving through air, Normal force  - Supports objects resting on a surface, independent variable - What you change in an investigation, Dependent variable  - What you measure in an investigation, Controlled variables  - Things kept the same to make the test fair, Smooth surface - Object travels farther, Rough surface - Object travels shorter distance, More force applied - Object moves faster, More mass - Harder to move,

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