force - a push or a pull that can change the position or motion of an object, gravity - a force that pulls objects toward the center of the earth, motion - the process of an object moving, pull - to move something toward or with you, push - to move something forward or away , magnetism - a force that pulls magnetic objects (certain metals), static electrical forces - a force that pull or push on objects without touching them, control - the object in an experiment that is not changed, controlled experiment - an experiment in which all variables are kept the same except for the one being tested (fair test), testable hypothesis - can be tested by an experiment, variable - a condition in an experiment that is changed , independent variable - the object or condition that is changed, work - to apply force to make an object move, unbalanced force - produce no change in motion of an object, balanced force - make objects start to move, speed up, slow down, or change direction., mass - the amount of matter in an object,

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