Question

what is Newton first law​

Answer 1

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Newton's first law postulates that there is (at least) one inertial reference frame for every object, in which said object will continue in uniform motion unless acted upon by a force. Without the first law to assert that there is indeed a frame in which F=0 implies a=0, the second law is vacuous.

Answer 2

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sɪʀ ɪssᴀᴄ ɴᴇᴡᴛᴏɴ ʜᴀs ɢɪᴠᴇɴ ᴛʜʀᴇᴇ ʟᴀᴡs ᴛᴏ ᴅᴇsᴄʀɪʙᴇ ᴍᴏᴛɪᴏɴ ᴏғ ᴀɴ ᴏʙᴊᴇᴄᴛ. ᴛʜᴇ ғɪʀsᴛ ʟᴀᴡ ɪs,

" ᴇᴠᴇʀʏ ʙᴏᴅʏ ᴄᴏɴᴛɪɴᴜᴇs ᴛᴏ ʙᴇ ɪɴ ɪᴛ's sᴛᴀᴛᴇ ᴏғ ʀᴇsᴛ (ᴏʀ) ᴜɴɪғᴏʀᴍ ᴍᴏᴛɪᴏɴ ɪɴ ᴀ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇ ᴜɴʟᴇss ɪᴛ ɪs ᴀᴄᴛᴇᴅ ᴜᴘᴏɴ ʙʏ ᴀ ɴᴇᴛ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ ᴛᴏ ᴄʜᴀɴɢᴇ ᴛʜᴀᴛ sᴛᴀᴛᴇ."

'ᴛʜɪs ʟᴀᴡ ᴅᴇғɪɴᴇs ɪɴᴇʀᴛɪᴀ, ғᴏʀᴄᴇ ᴀɴᴅ ᴍᴇᴄʜᴀɴɪᴄᴀʟ ᴇǫᴜɪʟɪʙʀɪᴜᴍ.