<P> Translated to English, this reads: </P> <Table> <Tr> <Td> "</Td> <Td> Law III: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts . </Td> <Td>" </Td> </Tr> </Table> <Tr> <Td> "</Td> <Td> Law III: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts . </Td> <Td>" </Td> </Tr> <P> Newton's Scholium (explanatory comment) to this law: </P>

An object in motion stays in motion unless acted upon by another force