Gravity: Everything is attracted to the center of the earth., He dropped his mic., She threw the ball up and it came back down., The sky divers jumped out of plane and fell to the earth., Friction: He cross country skied on smooth snow., Pushing a stroller on a trail is challenging., The soccer ball slowed down on the grass after he kicked it., The hockey puck slide across the ice after being hit with the stick.,

Which force is it? Gravity or Friction?

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