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2. What is static friction?
A. It is produced when an object rolls over a surface.
B. It is caused by chemical bonding between surfaces.
C. It is a kind of friction that prevents an object from moving against
a surface.
D. It is a friction between moving objects and a liquid or between an
object moving in the air.
3. What is a friction that occurs in stationary objects?
A. fluid friction
B. static friction
C. rolling friction
D. sliding friction​