Make all capitalization consistent with the rules of convention outlined in the American Heritage Dictionary. DO capitalize: The first word and any proper nouns in a title, heading, or subheading. Proper nouns, months, days of the week, but not the seasons.
Newton (unit) The newton (symbol: N) is the SI unit of force. It is named after Sir Isaac Newton because of his work on classical mechanics. A newton is how much force is required to make a mass of one kilogram go faster at a rate of one metre per second squared.
Isaac Newton, an English mathematician and physicist, is considered the greatest scientist of all time. Among his many discoveries, the most important is probably his law of universal gravitation. In 1664, Newton figured out that gravity is the force that draws objects toward each other.