What do supernova have to do with heavy elements?

When  a star dies, it is called a  supernova.  A supernova contains massive amounts of energy, and the hydrogen and helium that was originally in the star turns into heavier elements ranging from oxygen to iron to gold.

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Explanation:

During the supernova nucleosynthesis, the r-process creates heavy isotopes, which decay after the event to the first stable isotope, thereby creating the neutron-rich stable isotopes of all heavy elements. The neutron capture occurs in high neutron density with high-temperature conditions.

be subject to a force andchange its motion

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this