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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