What is the nature of light and how do we explain the phenomena of reflection, refraction, and diffraction?
How do electric circuits work and what are the basic principles of circuit analysis?
How does the behavior of gases and liquids differ and what are the equations that describe their behavior?
What is the difference between kinetic energy and potential energy?
How do we calculate the motion of objects using Newton's laws of motion?
What is quantum mechanics and how does it explain the behavior of subatomic particles?