assertion - friction is caused by the irregularities on the two surfaces in contact
reason - irregularities on the two surfaces lock into one another when they are in contact
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Both a and r are true but r is not the correct answer for a
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assertion is true and reason is also true and it is the correct explanation of the assertion.
Explanation:
the main reason behind friction is this only that the hills and the crest arrange themselves in a interlocking pattern .
You can also say that at atomic level their is a weak chemical bond between the surfaces.
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