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.
Newton is the unit of force in the International Systems of Units. Force is the product of the mass of any particular body and its acceleration. Hence when we talk about one Newton of force, we're focusing on a body that has one kilogram of mass and is travelling with an acceleration of one meter per second squared.