[More About Power Words](https://www.snexplores.org/power-words-aid-stem-literacy/)
**colleague**: Someone who works with another; a co-worker or team member.
**factor**: Something that plays a role in a particular condition or event; a contributor.
**force**: Some outside influence that can change the motion of an object, hold objects close to one another, or produce motion or stress in a stationary object.
**gravity**: The force that attracts anything with mass, or bulk, toward any other thing with mass. The more mass that something has, the greater its gravity.
**gyration**: A quick rapid circular, spiraling or whirling motion.
**migrate**: To move long distances in search of a new home. (in science) To travel from one place to another in an attempt to achieve new conditions that may afford stability.
**physics**: The scientific study of the nature and properties of matter and energy. Classical physics is an explanation of the nature and properties of matter and energy that relies on descriptions such as Newton’s laws of motion. Quantum physics, a field of study that emerged later, is a more accurate way of explaining the motions and behavior of matter. A scientist who works in such areas is known as a physicist.
_**Proceedings of the National Academy of Sciences**_: A prestigious journal publishing original scientific research, begun in 1914. The journal's content spans the biological, physical and social sciences. Each of the more than 3,000 papers it publishes each year, now, are not only peer reviewed but also approved by a member of the U.S. National Academy of Sciences.
**robot**: A machine that can sense its environment, process information and respond with specific actions. Some robots can act without any human input, while others are guided by a human.
**slope**: (in geology) The steeply pitched side of a cliff, hill or mountain. (in mathematics) The degree to which some line rises or falls from a strictly horizontal direction. A line that appears to rise as it moves to the right has a positive slope. One that appears to fall as runs to the right has a negative slope. Vertical lines have no slope.