acceleration - a change in velocity; speeding up, slowing down, change in direction, balanced force - net force is 0, forces cancel each other out, friction - opposite force of movement between two touching surfaces, Resultant force - combination of all forces on an object, speed - distance something travels in a certain amount of time, unbalanced force - net force greater than 0 in one direction, gravity - attractive force between objects with mass, mass - amount of matter in an solid, liquid, or gas, Newton (N) - unit to measure force, average speed - total distance something has traveled divided by total time, velocity - speed in a certain direction,

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