force - a push or pull, motion - a change in position; movement, balanced forces - forces in different directions are equal; no motion, unbalanced forces - forces in different directions are unequal; motion, weight - the measure of the pull of gravity on an object, gravity - the attractive force that pulls objects close to earth (or other objects); depends on distance and size, friction - force that opposes motion; rubbing together of two surfaces, buoyant force - the upward force that opposes gravity that is exerted by a fluid on an object that is submerged in it,

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