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Sue observes that when a baseball player slides toward a base, the ground exerts friction away from the base. Based on her observation, which conclusion is correct?Friction acts at a distance.
Friction is a contact force.
Friction is a non-contact force.
Friction acts in the direction of motion.

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friction is a contact force 

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Answer:

Friction is a contact force.

Explanation:

Friction is a contact force which means it act on any object when the object is in direct contact with any medium(solid,liquid,gas). Friction force always acts in the direction opposite to the motion of an object means it opposes motion. Ex: when a body moves it acts in opposite direction, when any object fall in the direction of gravity it will ct in the upward direction.

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