Gravitation - The force of attraction between two objects in the universe., MASS - The amount of matter in an object, constant everywhere in the universe., Weight - The force with which an object is attracted toward the Earth, measured in newtons (N)., Free Fall - The motion of a body under the influence of gravity alone., Density - Mass per unit volume of a substance, Buoyancy - The upward force exerted by a fluid on an object immersed in it., Pressure - The force applied per unit area, measured in pascals, Thrust - The force acting perpendicular to a surface.,

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