The rate an object changes speed - accelerate, The resistance to movement provided by air particles - air resistance, The surface area of an object - cross-section, When the resultant force in a certain direction is zero - balanced forces, The force applied by air resistance - drag, The force applied by the Earth pulling an object towards the ground - gravity, Motion with no acceleration other than that provided by gravity - free-fall, The speed an object reaches when balanced forces act on a falling object - terminal speed,

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