Introduction: Explain what your topic is, the question you're trying to answer. What is its significance: social, economic, medical or technological? How does mankind benefit from knowing the answer? Does it satisfy human curiosity in some way? What are the long-term consequences of knowing the answer?
Body: Explain the answer to your question, starting from basic physical principles, describing any scientific terms in layman's words. Include at least three pieces of numerical facts or equations and two images/graphs. Be sure to cite your sources. What is the underlying theory?Who pioneered the research into this topic? Has human perception changed on relevant "facts"? Is there existing controversy?
Conclusion: summarize your question and answer. Raise questions about what is still being researched or is still under debate. If discussing a social issue, what is the future outlook?
Example topics:
Mechanics
The biomechanics of a runner: what happens at the starting block?
How does friction evolve in arthritic joints?
How do centrifuges work?
What happens when you break a bone?
Is time measurement different for astronauts?
Thermodynamics
What is the most efficient machine humans can make?
What is co-generation?
Waves, Electricity and Magnetism
The physics of music: how is sound generated and received?
How do earthquake vibrations travel?
How do electronic signals function in our brain?
Nuclear Physics
What are the mutagenic effects of radiation?
What is the best method to dispose of nuclear waste?
Is nuclear energy more efficient than solar or wind?
Energy
What is the limiting efficiency of a solar panel?
What are the energy conversion processes inside a human being?