Question

what is friction ???​

Answer 1

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Answer 2

ғʀɪᴄᴛɪᴏɴ ɪs ᴀ ғᴏʀᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴛᴡᴏ sᴜʀғᴀᴄᴇs ᴛʜᴀᴛ ᴀʀᴇ sʟɪᴅɪɴɢ, ᴏʀ ᴛʀʏɪɴɢ ᴛᴏ sʟɪᴅᴇ, ᴀᴄʀᴏss ᴇᴀᴄʜ ᴏᴛʜᴇʀ.

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ʀᴇɢᴀʀᴅs :-)