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Motion & Forces Vocabulary Match the words to the correct definition. gravity a force of attraction between objects due to their masses acceleration a change in speed (velocity) or direction friction a force that opposes motion between two objects that are in contact inertia the tendency of an object to resistance a change in motion force a push or a pull (includes size and direction) work the result of a force moving an object (force and motion are same directio) mass a measure of the amount of matter in an object speed the rate of motion (distance ÷ time) net force combination of all the forces acting on an object velocity the speed of an object in a particular direction motion an object’s change in position weight the pull of gravity on an object newton the unit for force