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Preview questions
1. What is the primary cause of friction between two surfaces?
Surface smoothness · Weight of the object · Nature of the surfaces · Speed of movement
2. Which type of friction acts on an object that is not moving?
Kinetic friction · Static friction · Rolling friction · Fluid friction
3. What happens to friction when the surface area of contact increases?
Increases · Decreases · Remains the same · Becomes negligible
4. Which of the following surfaces would produce the least friction?
Sandpaper · Ice · Concrete · Rubber
5. Which force opposes the motion of an object sliding on a surface?
Gravity · Friction · Inertia · Magnetism
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