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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