Does friction always oppose the motion of the object.
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Answer:not always
Explanation:
because in some cases it is not so eg in case of cycle and ground it helps in motion.
OR
eg:consider a case in which two cubes are plaxed one above the other.when a force is applied on the lower cube it makes the cube move in+x direction and here the friction acts in-x direction but the upper cube moves in -x direction and its friction in +x direction i.e force applied to get a motion and friction moves in same direction
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