Why friction is called necessary evil
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ғʀɪᴄᴛɪᴏɴᴀʟ ғᴏʀᴄᴇ ᴄᴀᴜsᴇs ᴀ ʟᴏᴛ ᴏғ ʟᴏssᴇs ɪɴ ɢᴇɴᴇʀᴀʟ ᴜᴘᴋᴇᴇᴘ ᴀɴᴅ ᴡᴇᴀʀ ᴀɴᴅ ᴛᴇᴀʀ ᴏғ ᴍᴀᴄʜɪɴᴇʀʏ. ʜᴇɴᴄᴇ ɪᴛ ɪs ᴄᴏɴsɪᴅᴇʀᴇᴅ ᴀs ᴀ ᴇᴠɪʟ. ʙᴜᴛ ᴀʟᴍᴏsᴛ ᴀʟʟ ᴄʀᴜᴄɪᴀʟ ᴛᴀsᴋs ᴄᴀɴɴᴏᴛ ʙᴇ ᴄᴀʀʀɪᴇᴅ ᴏᴜᴛ ᴡɪᴛʜᴏᴜᴛ ᴛʜᴇ ᴘʀᴇsᴇɴᴄᴇ ᴏғ ғʀɪᴄᴛɪᴏɴ. ʜᴇɴᴄᴇ ɪᴛ ɪs ᴄᴏɴsɪᴅᴇʀᴇᴅ ᴀs ᴀ ɴᴇᴄᴇssᴀʀʏ ᴇᴠɪʟ .
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