Question

What was the two essential conditions which should be fulfilled to consider that work done? Give two examples of situations where work is done work is not done​

Answer 1

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ɪɴ ᴘʜʏsɪᴄs, ᴡᴏʀᴋ ɪs ᴅᴏɴᴇ ᴡʜᴇɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ᴍᴏᴠᴇs ᴛʜʀᴏᴜɢʜ ᴀ ᴄᴇʀᴛᴀɪɴ ᴅɪsᴛᴀɴᴄᴇ ɪɴ ᴀ ᴘᴀʀᴛɪᴄᴜʟᴀʀ ᴅɪʀᴇᴄᴛɪᴏɴ ᴀғᴛᴇʀ ᴛʜᴇ ғᴏʀᴄᴇ ʜᴀᴅ ʙᴇᴇɴ ᴀᴘᴘʟɪᴇᴅ ᴏɴ ɪᴛ.

ᴡᴏʀᴋ ᴅᴏɴᴇ = ғᴏʀᴄᴇ x ᴅɪsᴛᴀɴᴄᴇ x ᴄᴏs ᴛʜᴇᴛᴀ 1. ғᴏʀ ᴡᴏʀᴋ ᴛᴏ ʙᴇ ᴅᴏɴᴇ, ᴛʜᴇ ғᴏʀᴄᴇ ᴍᴜsᴛ ʙᴇ ᴀᴘᴘʟɪᴇᴅ ᴀɴᴅ ᴍᴜsᴛ ɴᴏᴛ ʙᴇ ᴢᴇʀᴏ. 2.

ᴛʜᴇ ʙᴏᴅʏ ᴏɴ ᴡʜɪᴄʜ ᴛʜᴇ ғᴏʀᴄᴇ ɪs ᴀᴘᴘʟɪᴇᴅ ᴍᴜsᴛ ᴍᴏᴠᴇ ɪɴ ᴏɴᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏʀ ᴛʜᴇ ᴏᴛʜᴇʀ ᴀɴᴅ ʜᴇɴᴄᴇ ᴛʜᴇ s ᴍᴜsᴛ ɴᴏᴛ ʙᴇ ᴢᴇʀᴏ. 3. ᴛʜᴇ ғᴏʀᴄᴇ ᴍᴜsᴛ ɴᴏᴛ ʙᴇ ᴀᴘᴘʟɪᴇᴅ ᴀᴛ 90 ᴅᴇɢʀᴇᴇs ᴀɴɢʟᴇ ᴜᴘᴏɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ᴀs ᴄᴏs 90 ᴇϙᴜᴀʟs ᴢᴇʀᴏ. sᴏ ɪɴ ᴀ ʟᴀʏᴍᴀɴ's ᴛᴇʀᴍs, ᴄᴏɴ ᴇxᴀᴍᴘʟᴇ. ʟᴇᴛ's sᴀʏ ʏᴏᴜ ʜᴀᴠᴇ ᴀ ᴡᴏᴏᴅᴇɴ ᴛʀᴜɴ ɪɴ ʏᴏᴜʀ ʀᴏᴏᴍ.