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Answers
Explanation:
11. The friction between two bodies that are in sliding contact. — called also kinetic friction.
12. Objects moving in fluids face the friction of the fluid that opposes their motion. So Objects moving in fluids must have unique shapes called streamlined shapes to reduce the fluid friction.
13. For a given two surface, sliding friction is slightly lesser than that of the static friction because it is easy to move the object which already in motion than the object which is at rest.
Q. Define sliding friction?
Answer : sliding Friction is the force that opposes the movement or slide of an object.
Q. Explain why objects moving in fluid must have special shape.
Answer : Moving objects in fluid must have special shapes because the drag force or the friction force depends of the shape of the object.
Q, Explain why the sliding friction in less than static friction.
Answer : The two sliding objects find less time to get interlocked against each other (objects and irregularities of surface). So they get less friction.
Hence, sliding friction is always less than static friction.