Question

1. Define frictional force.
2. State two advantages and two disadvantages of friction.​

Answer 1

1. ғʀɪᴄᴛɪᴏɴ ɪs ᴛʜᴇ ғᴏʀᴄᴇ ʀᴇsɪsᴛɪɴɢ ᴛʜᴇ ʀᴇʟᴀᴛɪᴠᴇ ᴍᴏᴛɪᴏɴ ᴏғ sᴏʟɪᴅ sᴜʀғᴀᴄᴇs, ғʟᴜɪᴅ ʟᴀʏᴇʀs, ᴀɴᴅ ᴍᴀᴛᴇʀɪᴀʟ ᴇʟᴇᴍᴇɴᴛs sʟɪᴅɪɴɢ ᴀɢᴀɪɴsᴛ ᴇᴀᴄʜ ᴏᴛʜᴇʀ. ᴛʜᴇʀᴇ ᴀʀᴇ sᴇᴠᴇʀᴀʟ ᴛʏᴘᴇs ᴏғ ғʀɪᴄᴛɪᴏɴ: ᴅʀʏ ғʀɪᴄᴛɪᴏɴ ɪs ᴀ ғᴏʀᴄᴇ ᴛʜᴀᴛ ᴏᴘᴘᴏsᴇs ᴛʜᴇ ʀᴇʟᴀᴛɪᴠᴇ ʟᴀᴛᴇʀᴀʟ ᴍᴏᴛɪᴏɴ ᴏғ ᴛᴡᴏ sᴏʟɪᴅ sᴜʀғᴀᴄᴇs ɪɴ ᴄᴏɴᴛᴀᴄᴛ.
2. ғʀɪᴄᴛɪᴏɴ ᴘʀᴏᴅᴜᴄᴇs ᴜɴɴᴇᴄᴇssᴀʀʏ ʜᴇᴀᴛ ʟᴇᴀᴅɪɴɢ ᴛᴏ ᴛʜᴇ ᴡᴀsᴛᴀɢᴇ ᴏғ ᴇɴᴇʀɢʏ. ᴛʜᴇ ғᴏʀᴄᴇ ᴏғ ғʀɪᴄᴛɪᴏɴ ᴀᴄᴛs ɪɴ ᴛʜᴇ ᴏᴘᴘᴏsɪᴛᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ᴍᴏᴛɪᴏɴ, sᴏ ғʀɪᴄᴛɪᴏɴ sʟᴏᴡs ᴅᴏᴡɴ ᴛʜᴇ ᴍᴏᴛɪᴏɴ ᴏғ ᴍᴏᴠɪɴɢ ᴏʙᴊᴇᴄᴛs. ... ᴀ ʟᴏᴛ ᴏғ ᴍᴏɴᴇʏ ɢᴏᴇs ɪɴᴛᴏ ᴘʀᴇᴠᴇɴᴛɪɴɢ ғʀɪᴄᴛɪᴏɴ ᴀɴᴅ ᴛʜᴇ ᴜsᴜᴀʟ ᴡᴇᴀʀ ᴀɴᴅ ᴛᴇᴀʀ ᴄᴀᴜsᴇᴅ ʙʏ ɪᴛ ʙʏ ᴜsɪɴɢ ᴛᴇᴄʜɴɪϙᴜᴇs ʟɪᴋᴇ ɢʀᴇᴀsɪɴɢ ᴀɴᴅ ᴏɪʟɪɴɢ.

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Answer 2

Answer:

Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. ... A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.