why friction is necessary?
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ғʀɪᴄᴛɪᴏɴᴀʟ ғᴏʀᴄᴇ ᴄᴀᴜsᴇs ᴀ ʟᴏᴛ ᴏғ ʟᴏssᴇs ɪɴ ɢᴇɴᴇʀᴀʟ ᴜᴘᴋᴇᴇᴘ ᴀɴᴅ ᴡᴇᴀʀ ᴀɴᴅ ᴛᴇᴀʀ ᴏғ ᴍᴀᴄʜɪɴᴇʀʏ. ... ʙᴜᴛ ᴀʟᴍᴏsᴛ ᴀʟʟ ᴄʀᴜᴄɪᴀʟ ᴛᴀsᴋs ᴄᴀɴɴᴏᴛ ʙᴇ ᴄᴀʀʀɪᴇᴅ ᴏᴜᴛ ᴡɪᴛʜᴏᴜᴛ ᴛʜᴇ ᴘʀᴇsᴇɴᴄᴇ ᴏғ ғʀɪᴄᴛɪᴏɴ. ʙᴀsɪᴄ ᴀᴄᴛɪᴠɪᴛɪᴇs ʟɪᴋᴇ ᴡᴀʟᴋɪɴɢ ᴀɴᴅ ᴡʀɪᴛɪɴɢ ᴏɴ ᴀ sᴜʀғᴀᴄᴇ ᴀʀᴇ ᴘᴏssɪʙʟᴇ ᴅᴜᴇ ᴛᴏ ғʀɪᴄᴛɪᴏɴ. ʜᴇɴᴄᴇ ɪᴛ ɪs ᴄᴏɴsɪᴅᴇʀᴇᴅ ᴀs ᴀ ɴᴇᴄᴇssᴀʀʏ ᴇᴠɪʟ .
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Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. ... But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil .
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