Friction is dependent on area of contact.
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ғʀɪᴄᴛɪᴏɴ ɪs ᴀ ᴄᴏɴᴛᴀᴄᴛ ғᴏʀᴄᴇ ᴡʜᴇɴ ᴛᴡᴏ sᴜʀғᴀᴄᴇs ɪɴᴛᴇʀᴀᴄᴛ. ... ɴᴏᴛɪᴄᴇ ᴛʜᴀᴛ ʙᴏᴛʜ ᴏғ ᴛʜᴇsᴇ ғʀɪᴄᴛɪᴏɴ ғᴏʀᴍᴜʟᴀs ᴏɴʟʏ ᴅᴇᴘᴇɴᴅ ᴏɴ ᴛʜᴇ ᴄᴏᴇғғɪᴄɪᴇɴᴛ ᴏғ ғʀɪᴄᴛɪᴏɴ ᴀɴᴅ ᴛʜᴇ ɴᴏʀᴍᴀʟ ғᴏʀᴄᴇ. ɪᴛ ᴅᴏᴇs ɴᴏᴛ ᴅᴇᴘᴇɴᴅ ᴛʜᴇ ᴀʀᴇᴀ ᴏғ ᴄᴏɴᴛᴀᴄᴛ, ɪᴛ ᴅᴏᴇsɴ'ᴛ ᴅᴇᴘᴇɴᴅ ᴏɴ ᴛʜᴇ sʟɪᴅɪɴɢ sᴘᴇᴇᴅ.
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