newton first law of motion : inertia newton second law
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ɴᴇᴡᴛᴏɴ's ғɪʀsᴛ ʟᴀᴡ
ɴᴇᴡᴛᴏɴ's ғɪʀsᴛ ʟᴀᴡ sᴛᴀᴛᴇs ᴛʜᴀᴛ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴡɪʟʟ ʀᴇᴍᴀɪɴ ᴀᴛ ʀᴇsᴛ ᴏʀ ɪɴ ᴜɴɪғᴏʀᴍ ᴍᴏᴛɪᴏɴ ɪɴ ᴀ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇ ᴜɴʟᴇss ᴀᴄᴛᴇᴅ ᴜᴘᴏɴ ʙʏ ᴀɴ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ. ɪᴛ ᴍᴀʏ ʙᴇ sᴇᴇɴ ᴀs ᴀ sᴛᴀᴛᴇᴍᴇɴᴛ ᴀʙᴏᴜᴛ ɪɴᴇʀᴛɪᴀ, ᴛʜᴀᴛ ᴏʙᴊᴇᴄᴛs ᴡɪʟʟ ʀᴇᴍᴀɪɴ ɪɴ ᴛʜᴇɪʀ sᴛᴀᴛᴇ ᴏғ ᴍᴏᴛɪᴏɴ ᴜɴʟᴇss ᴀ ғᴏʀᴄᴇ ᴀᴄᴛs ᴛᴏ ᴄʜᴀɴɢᴇ ᴛʜᴇ ᴍᴏᴛɪᴏɴ. ᴀɴʏ ᴄʜᴀɴɢᴇ ɪɴ ᴍᴏᴛɪᴏɴ ɪɴᴠᴏʟᴠᴇs ᴀɴ ᴀᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ, ᴀɴᴅ ᴛʜᴇɴ ɴᴇᴡᴛᴏɴ's sᴇᴄᴏɴᴅ ʟᴀᴡ ᴀᴘᴘʟɪᴇs.
ɴᴇᴡᴛᴏɴ's sᴇᴄᴏɴᴅ ʟᴀᴡ
ɴᴇᴡᴛᴏɴ's sᴇᴄᴏɴᴅ ʟᴀᴡ ᴀs sᴛᴀᴛᴇᴅ ʙᴇʟᴏᴡ ᴀᴘᴘʟɪᴇs ᴛᴏ ᴀ ᴡɪᴅᴇ ʀᴀɴɢᴇ ᴏғ ᴘʜʏsɪᴄᴀʟ ᴘʜᴇɴᴏᴍᴇɴᴀ, ʙᴜᴛ ɪᴛ ɪs ɴᴏᴛ ᴀ ғᴜɴᴅᴀᴍᴇɴᴛᴀʟ ᴘʀɪɴᴄɪᴘʟᴇ ʟɪᴋᴇ ᴛʜᴇ ᴄᴏɴsᴇʀᴠᴀᴛɪᴏɴ ʟᴀᴡs. ɪᴛ ɪs ᴀᴘᴘʟɪᴄᴀʙʟᴇ ᴏɴʟʏ ɪғ ᴛʜᴇ ғᴏʀᴄᴇ ɪs ᴛʜᴇ ɴᴇᴛ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ. ɪᴛ ᴅᴏᴇs ɴᴏᴛ ᴀᴘᴘʟʏ ᴅɪʀᴇᴄᴛʟʏ ᴛᴏ sɪᴛᴜᴀᴛɪᴏɴs ᴡʜᴇʀᴇ ᴛʜᴇ ᴍᴀss ɪs ᴄʜᴀɴɢɪɴɢ, ᴇɪᴛʜᴇʀ ғʀᴏᴍ ʟᴏss ᴏʀ ɢᴀɪɴ ᴏғ ᴍᴀᴛᴇʀɪᴀʟ, ᴏʀ ʙᴇᴄᴀᴜsᴇ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪs ᴛʀᴀᴠᴇʟɪɴɢ ᴄʟᴏsᴇ ᴛᴏ ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ ʟɪɢʜᴛ ᴡʜᴇʀᴇ ʀᴇʟᴀᴛɪᴠɪsᴛɪᴄ ᴇғғᴇᴄᴛs ᴍᴜsᴛ ʙᴇ ɪɴᴄʟᴜᴅᴇᴅ. ɪᴛ ᴅᴏᴇs ɴᴏᴛ ᴀᴘᴘʟʏ ᴅɪʀᴇᴄᴛʟʏ ᴏɴ ᴛʜᴇ ᴠᴇʀʏ sᴍᴀʟʟ sᴄᴀʟᴇ ᴏғ ᴛʜᴇ ᴀᴛᴏᴍ ᴡʜᴇʀᴇ ǫᴜᴀɴᴛᴜᴍ ᴍᴇᴄʜᴀɴɪᴄs ᴍᴜsᴛ ʙᴇ ᴜsᴇᴅ.
ɴᴇᴡᴛᴏɴ's ᴛʜɪʀᴅ ʟᴀᴡ
ɴᴇᴡᴛᴏɴ's ᴛʜɪʀᴅ ʟᴀᴡ: ᴀʟʟ ғᴏʀᴄᴇs ɪɴ ᴛʜᴇ ᴜɴɪᴠᴇʀsᴇ ᴏᴄᴄᴜʀ ɪɴ ᴇǫᴜᴀʟ ʙᴜᴛ ᴏᴘᴘᴏsɪᴛᴇʟʏ ᴅɪʀᴇᴄᴛᴇᴅ ᴘᴀɪʀs. ᴛʜᴇʀᴇ ᴀʀᴇ ɴᴏ ɪsᴏʟᴀᴛᴇᴅ ғᴏʀᴄᴇs; ғᴏʀ ᴇᴠᴇʀʏ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ ᴛʜᴀᴛ ᴀᴄᴛs ᴏɴ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴛʜᴇʀᴇ ɪs ᴀ ғᴏʀᴄᴇ ᴏғ ᴇǫᴜᴀʟ ᴍᴀɢɴɪᴛᴜᴅᴇ ʙᴜᴛ ᴏᴘᴘᴏsɪᴛᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴡʜɪᴄʜ ᴀᴄᴛs ʙᴀᴄᴋ ᴏɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ᴡʜɪᴄʜ ᴇxᴇʀᴛᴇᴅ ᴛʜᴀᴛ ᴇxᴛᴇʀɴᴀʟ ғᴏʀᴄᴇ. ɪɴ ᴛʜᴇ ᴄᴀsᴇ ᴏғ ɪɴᴛᴇʀɴᴀʟ ғᴏʀᴄᴇs, ᴀ ғᴏʀᴄᴇ ᴏɴ ᴏɴᴇ ᴘᴀʀᴛ ᴏғ ᴀ sʏsᴛᴇᴍ ᴡɪʟʟ ʙᴇ ᴄᴏᴜɴᴛᴇʀᴇᴅ ʙʏ ᴀ ʀᴇᴀᴄᴛɪᴏɴ ғᴏʀᴄᴇ ᴏɴ ᴀɴᴏᴛʜᴇʀ ᴘᴀʀᴛ ᴏғ ᴛʜᴇ sʏsᴛᴇᴍ sᴏ ᴛʜᴀᴛ ᴀɴ ɪsᴏʟᴀᴛᴇᴅ sʏsᴛᴇᴍ ᴄᴀɴɴᴏᴛ ʙʏ ᴀɴʏ ᴍᴇᴀɴs ᴇxᴇʀᴛ ᴀ ɴᴇᴛ ғᴏʀᴄᴇ ᴏɴ ᴛʜᴇ sʏsᴛᴇᴍ ᴀs ᴀ ᴡʜᴏʟᴇ. ᴀ sʏsᴛᴇᴍ ᴄᴀɴɴᴏᴛ "ʙᴏᴏᴛsᴛʀᴀᴘ" ɪᴛsᴇʟғ ɪɴᴛᴏ ᴍᴏᴛɪᴏɴ ᴡɪᴛʜ ᴘᴜʀᴇʟʏ ɪɴᴛᴇʀɴᴀʟ ғᴏʀᴄᴇs - ᴛᴏ ᴀᴄʜɪᴇᴠᴇ ᴀ ɴᴇᴛ ғᴏʀᴄᴇ ᴀɴᴅ ᴀɴ ᴀᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ, ɪᴛ ᴍᴜsᴛ ɪɴᴛᴇʀᴀᴄᴛ ᴡɪᴛʜ ᴀɴ ᴏʙᴊᴇᴄᴛ ᴇxᴛᴇʀɴᴀʟ ᴛᴏ ɪᴛsᴇʟғ.
Answer:
mass and force.....
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