acceleration - the rate of change in velocity; can mean speeding up, slowing down or changing direction, air resistance - the frictional force between air and objects moving through it, balanced forces - acceleration forces are equal but in opposite directions, force - a push or a pull, measured in Newtons, friction - a force that opposes motion between two objects that are touching and causes an object to slow down or come to a stop, gravity - an attractive force that exists between all objects that have mass; the greater the mass, the greater the gravity between the objects, inertia - the tendency of an object to resist a change in motion, speed - dividing the total distance by the total time it took to cover that distance, unbalanced forces - forces are unequal and cause an object to accelerate, velocity - speed in a certain direction such as 70 mph east,

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