human
What are the most important things to remember about physics?
assistant
1. The laws of physics are universal and apply everywhere, no matter how small or large an object is.
2. Energy cannot be created or destroyed; it can only change forms.
3. For every action, there is an equal and opposite reaction.
4. Every particle has a corresponding antiparticle with opposite charge and spin.
5. The speed of light in a vacuum is constant for all observers, regardless of their relative motion.
6. The universe is expanding at an ever-increasing rate.
7. The force of gravity is always attractive, even between two objects with the same mass.