Question

Answer these questions...ASAP!

1) Is it possible that a body is displaced and yet it's work done is zero? If yes, write an example.

2) A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km, he forgot his own path at a round of radius 100 m. However, he moves on the circular path for 1 1/2 cycle and then he moves forward upto 2 km. Calculate the work done by him.​

Answer 1

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$\huge\fcolorbox{black}{aqua}{Añswers:-}$

⛄ 1) ʏᴇs, ɪᴛ ɪs ᴘᴏssɪʙʟᴇ ᴛʜᴀᴛ ᴀ ʙᴏᴅʏ ɪs ᴅɪsᴘʟᴀᴄᴇᴅ ᴀɴᴅ ʏᴇᴛ ɪᴛ's ᴡᴏʀᴋ ᴅᴏɴᴇ ɪs 0. ғᴏʀ ɪɴsᴛᴀɴᴄᴇ, ᴀ sᴀᴛᴇʟʟɪᴛᴇ ᴍᴏᴠɪɴɢ ᴀʀᴏᴜɴᴅ ᴛʜᴇ ᴇᴀʀᴛʜ. ʜᴇʀᴇ, ᴛʜᴇ ᴡᴏʀᴋ ᴅᴏɴᴇ ɪs ᴢᴇʀᴏ, sɪɴᴄᴇ ᴛʜᴇ ғᴏʀᴄᴇ ɪs ᴀᴄᴛɪɴɢ ᴘᴇʀᴘᴇɴᴅɪᴄᴜʟᴀʀ ᴛᴏ ᴛʜᴇ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ ᴛᴀᴋɪɴɢ ᴘʟᴀᴄᴇ.

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⛄ 2) ★ Given:-

✒ ғʀɪᴄᴛɪᴏɴᴀʟ ғᴏʀᴄᴇ, ғ = 5 ɴ.

ᴛʜᴜs, ᴛᴏᴛᴀʟ ᴅɪsᴛᴀɴᴄᴇ ᴛʀᴀᴠᴇʀsᴇᴅ ʙʏ ᴛʜᴇ ʙᴏʏ:-

s= 1.5 ᴋᴍ + 1.5 (2π × 10ᴍ) + 2.0 ᴋᴍ

= 1500ᴍ + 942ᴍ + 2000ᴍ

= 4442ᴍ.

ᴡᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ,

ᴡᴏʀᴋ ᴅᴏɴᴇ, ᴡ = ғᴏʀᴄᴇ (ғ) × ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ (s)

= 5ɴ × 4442ᴍ

= 2210 ᴊ

⛄ ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴇ ᴡᴏʀᴋ ᴅᴏɴᴇ ʙʏ ᴛʜᴇ ʙᴏʏ ɪs 2210 ᴊ.

★ ɴᴏᴛᴇ:-

⛄ ᴡᴇ sʜᴏᴜʟᴅ ᴛᴀᴋᴇ ᴛʜᴇ ᴅɪsᴛᴀɴᴄᴇ ᴄᴏᴠᴇʀᴇᴅ ᴡʜɪʟᴇ ᴍᴏᴠɪɴɢ ɪɴᴛᴏ ᴀ ᴄɪʀᴄᴜʟᴀʀ ᴘᴀᴛʜ ᴀs 1.5 ᴛɪᴍᴇs ɪᴛs ᴄɪʀᴄᴜᴍғᴇʀᴇɴᴄᴇ (2πʀ) ᴀɴᴅ ɴᴏᴛ ɪᴛs ᴅɪᴀᴍᴇᴛᴇʀ, sɪɴᴄᴇ ᴡᴏʀᴋ ɪs ᴅᴏɴᴇ ᴀɢᴀɪɴsᴛ ғʀɪᴄᴛɪᴏɴ ғᴏʀ ᴛʜᴇ ᴇɴᴛɪʀᴇ ᴏɴᴇ ᴀɴᴅ ʜᴀʟғ ᴄʏᴄʟᴇ.

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