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1.The friction between two surfaces that are not moving past each other

A fluid friction

C. sliding friction

B. rolling friction

D. static friction

2.Which of these is the best lubricant to reduce friction on motorcycle
gears?

A alcohol

C. sand

B. oil

D. water

3.What is friction?
A Force opposes motions

B. Amount of force exerted due to gravity

A. Force of attraction between two objects

B. Rate at which an object changes motion​