Question

Q-5) State and prove law of conservation of energy.​

Answer 1

Answer:

☛ʟᴀᴡ ᴏғ ᴄᴏɴsᴇʀᴠᴀᴛɪᴏɴ ᴏғ ᴇɴᴇʀɢʏ sᴛᴀᴛᴇs ᴛʜᴀᴛ ᴛʜᴇ ᴇɴᴇʀɢʏ ᴏғ ᴀ sʏsᴛᴇᴍ ɪs ᴀʟᴡᴀʏs ᴄᴏɴsᴛᴀɴᴛ.

☛ɪɴ ᴏᴛʜᴇʀ ᴡᴏʀᴅs, ᴡᴇ ᴄᴀɴ sᴀʏ ᴛʜᴀᴛ ᴇɴᴇʀɢʏ ᴄᴀɴ ɴᴇɪᴛʜᴇʀ ʙᴇ ᴄʀᴇᴀᴛᴇᴅ ɴᴏʀ ᴅᴇsᴛʀᴏʏᴇᴅ.

☛ᴍᴇᴄʜᴀɴɪᴄᴀʟ ᴇɴᴇʀɢʏ (ᴇ) ɪs ᴛʜᴇ sᴜᴍ ᴏғ ᴛʜᴇ ᴘᴏᴛᴇɴᴛɪᴀʟ ᴇɴᴇʀɢʏ (ᴜ) ᴀɴᴅ ᴛʜᴇ ᴋɪɴᴇᴛɪᴄ ᴇɴᴇʀɢʏ (ᴋ) ᴏғ ᴛʜᴇ ғʀᴇᴇʟʏ ғᴀʟʟɪɴɢ ʙᴏᴅʏ. ᴛʜᴇʀᴇғᴏʀᴇ, ᴇ=ᴋ+ᴜ=ᴄᴏɴsᴛᴀɴᴛ.

Answer 2

Law of conservation of energy states that the energy of a system is always constant. In other words, we can say that energy can neither be created nor destroyed. ... Mechanical energy (E) is the sum of the potential energy (U) and the kinetic energy (K) of the freely falling body. Therefore, E=K+U=constant.