Question

1.Is motion and relative motion both are same?
2.why friction opposes relative motion and not motion?
3. All bodies which are in motion also called as in relative motion,But all bodies which are in relative motion are not called as in motion.
Is this statement correct??

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Answer 1

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Friction opposes the relative motion between the surfaces in contact with each other.

Friction is the force that opposes relative motion or tendency of relative motion between two surfaces in contact. When two surfaces move relative to each other or they have a tendency to move relative to each other, at the point (or surface) of contact, there appears a force which opposes this relative motion or tendency of relative motion between two surfaces in contact. It acts on both the surfaces in contact with equal magnitude and opposite directions (Newton's 3rd law). also Friction force tries to stop relative motion between two surfaces in contact.

Answer 2

Answer:

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Condensation is the change of the physical state of matter from the gas phase into the liquid phase, and is the reverse of vaporization. ... It can also be defined as the change in the state of water vapor to liquid water when in contact with a liquid or solid surface or cloud condensation nuclei within the atmosphere.