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The Real-World Science Supplement
to Scholastic News.
a force that pulls two objects toward each other
When you drop something, the force of gravity makes it fall downward.
how fast an object moves over time
A racecar gained speed over the first minute of the race.
motion of an object based on its speed and mass (amount of matter in an object)
A snowboarder gained momentum as she traveled down the mountain.
resistance to movement when two surfaces rub together
Friction is what stops a ball from rolling across rough grass.