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Which of the following factors affect friction?

1. Nature of the surface
2. Weight of the object placed over other
3. Motion or speed of the object
4. All of the above

Correct answer: All of the above

Solution

Friction is influenced by the nature of the surfaces in contact, the normal force or weight pressing them together, and in many practical situations the motion/speed conditions. Since each listed factor can affect friction, the correct choice is the one that includes all of them.

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