What is the condition imposed on force for law of conservation
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➞ᴛʜᴇ ʟᴀᴡ ᴏғ ᴄᴏɴsᴇʀᴠᴀᴛɪᴏɴ ᴏғ ᴍᴏᴍᴇɴᴛᴜᴍ sᴀʏs ᴛʜᴀᴛ ᴛʜᴇ ᴍᴏᴍᴇɴᴛᴜᴍ ᴏғ ᴀ ᴄʟᴏsᴇᴅ sʏsᴛᴇᴍ ɪs ᴄᴏɴsᴛᴀɴᴛ ɪɴ ᴛɪᴍᴇ (ᴄᴏɴsᴇʀᴠᴇᴅ).
➞ᴀ ᴄʟᴏsᴇᴅ (ᴏʀ ɪsᴏʟᴀᴛᴇᴅ) sʏsᴛᴇᴍ ɪs ᴅᴇғɪɴᴇᴅ ᴛᴏ ʙᴇ ᴏɴᴇ ғᴏʀ ᴡʜɪᴄʜ ᴛʜᴇ ᴍᴀss ʀᴇᴍᴀɪɴs ᴄᴏɴsᴛᴀɴᴛ, ᴀɴᴅ ᴛʜᴇ ɴᴇᴛ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ ɪs ᴢᴇʀᴏ.
➞ᴛʜᴇ ᴛᴏᴛᴀʟ ᴍᴏᴍᴇɴᴛᴜᴍ ᴏғ ᴀ sʏsᴛᴇᴍ ɪs ᴄᴏɴsᴇʀᴠᴇᴅ ᴏɴʟʏ ᴡʜᴇɴ ᴛʜᴇ sʏsᴛᴇᴍ ɪs ᴄʟᴏsᴇᴅ.
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