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6 science Unit F L1 vocabulary

forcea push or pull
gravitythe force that pulls everything toward the center of earth; the force of gravitation on Earth
Newtonthe metric unit for forces including weight
speeda measure of how far something moves during a period of time
average speedthe measure of the total distance an object has moved divided by the total time elapsed
velocitythe speed of an object in a particular direction
frictiona force that opposes motion whenever two surfaces rub against each other
balanced forcesthe opposite forces acting on an object that cancel each other out
unbalanced forcesthe forces acting on an object that causes a change in velocity, making the object speed up, slow down, or change direction

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