Part of Newton's first law of motion states that an object in motion stays in motion.
From the sacbee.com
Newton placed the first law of motion to establish frames of reference for which the other laws are applicable.
From the en.wikipedia.org
Like Newton's first law of motion, Einstein's theory states that if a force is applied on an object, it would deviate from a geodesic.
From the en.wikipedia.org
As Newton attests, the Principia's first law of motion was known in antiquity, even by Aristotle, although its significance, as such, went unappreciated.
From the en.wikipedia.org
But, it turns out, middle and high school students are having most of the fun, building their erector sets and dropping eggs into water to test the first law of motion.
From the nytimes.com
According to Newton's first law of motion, objects that experience no net force will continue to move in a straight line with a constant velocity until they are subject to a net force.
From the en.wikipedia.org
Galileo formulated and successfully tested several results in dynamics, in particular the law of inertia, which later became the first law in Newton's laws of motion.
From the en.wikipedia.org
Finding that an elliptical orbit fit the Mars data, he immediately concluded that all planets move in ellipses, with the sun at one focus-Kepler's first law of planetary motion.
From the en.wikipedia.org
In the 17th century, Johannes Kepler discovered that the orbits along which the planets travel around the Sun are ellipses with the Sun at one focus, in his first law of planetary motion.