Answer :
Whenever a body is in motion there is always a friction to oppose the motion.
What is friction ?
"Friction is a force that resists the motion of one object against another."
Friction is a force that opposes relative motion between surfaces in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between surfaces and always in a direction that opposes motion or attempted motion of the systems relative to each other.
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