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1) What is friction? a. Force opposes motions. b. Amount of force exerted due to gravity. C. Force of attraction between two objects d. Rate at which an object changes motion 2) Which of the following is NOT an example of reducing friction? a. Icy roads C. sandy floor b. Polished floor d. wet floor 3) Which kind of friction occurs as a fish swims through the water? c. sliding b. rolling d. static 4) Which of these is the best lubricant to reduce friction on motorcycle gears? a. fluid a. alcohol C. sand b. oil d. water 5) Why does sandpaper have lots of friction? a. It can be slippery b. It can tear very easily C. It has rough surface d. It has smooth surface 6) What pulls the object to the ground? a. speed c. motion b. gravity d. friction 7) Which object would be most difficult to lift against gravity? a. a car c. a spoon da marble
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