No gravity? Wow. Well, I guess you could make your paper very short if you assume this happens suddenly.
The sun would start to fall apart as the hot gases held by gravity begin to spiral out into empty space. It would die out quickly, plunging Earth into icy darkness. On Earth, the atmosphere would head into space and the decompression (and lack of oxygen) would ruin the afternoon very quickly. Long lines for SpaceX tickets would form, but is the loss of gravity a univeral change, or does it happen only to Earth? If universal, then there is no safe place. The upside is that you wouldn't need to finish taxes nor mow the lawn. An entrepreneur could make a killing selling pressurized living pods, but there would be no electricity to maintain pressure or provide warmth and light, nor supplies for longer term. Life in a pod with others would make a separate story. As Earth's atmophere bleeds off, contests abound for Donald Duck and Mikey Mouse imitators as the thinner air causes everyone's voice to highten and start squeaking.
If you have a choice of what natural law goes haywire, perhaps pick one that creates a situation that allows the continuation of humanity, allbeit under unusual circumstances. Maybe if the law of entropy were reversed, there might be some time to observe and then finish taxes and see a movie. When the sun rises, everthing gets dark as the energy heads into the sun, for example. Helium balloons would retain their magical lift longer as the He atoms have less incentive to get away from each other.