* It's too basic and already well-established. The answer is gravity, which is a fundamental concept in physics that has been extensively studied and explained. There is no room for new research or analysis on this basic level.
* It lacks focus and depth. The question doesn't delve into any specific aspects of gravity or object motion. To make a research essay, you need a focused question that can be explored in depth and lead to original insights.
* It's not open-ended. The question doesn't invite further investigation or exploration. It's a closed question with a simple answer. A good research essay should raise more questions than it answers.
To make this a more suitable research question, you could:
* Focus on a specific aspect of gravity:
* How does gravity vary depending on the mass of the object?
* How does the shape of an object affect its fall?
* What are the limits of gravity's reach?
* Explore the history of understanding gravity:
* How did our understanding of gravity evolve over time?
* What are the major breakthroughs in gravity research?
* Examine the practical applications of gravity:
* How is gravity used in technology and engineering?
* What are the implications of gravity on space exploration?
By refining the question and adding depth, you can transform it into a topic suitable for a research essay.