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Gravity-also called gravitation,in mechanics the universal force of attraction acting between all matter
Friction-resistance to motion of one object moving relative to another
Mass and weight-mass is according to the area and space of certain place or object while weight is according to heavyness and lightness of an object
Free fall-An object in the technical sense of the term "free fall" may not necessarily be falling down in the usual sense of the term. An object moving upwards might not normally be considered to be falling, but if it is subject to only the force of gravity, it is said to be in free fall. The Moon is thus in free fall around the Earth, though its orbital speed keeps it in very far orbit from the Earth's surface.
Sorry if free fall is long
Correct me if I'm wrong
Good luck