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.
Meter is a distance. Newton-meter is 'work' or 'energy'. It's the amount of work you do, or the amount of energy it takes, to push with. a force of 1 newton, and keep pushing until you've moved 1 meter.