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# How Things Work 1.1

### vocabulary from section 1.1 of How Things Work, by Louis A. Bloomfield

acceleration vector quantity that measures how quickly an object's velocity is changing
acceleration due to gravity at earth's surface 9.8 meters per second squared (9.8 newtons per kilogram)
components portions of a vector quantity that lie along particular directions
force vector quantity that measures how much force in placed on an object and in what direction
inertia property of matter by which it remains at rest or in uniform motion unless acted on by an outside force
magnitude amount of some physical quantity
mass measure of an object's inertia
newton SI unit of force
Newton's first law of motion An object at rest will remain at rest and an object in motion will remain in constant motion unless acted on by an outside force
Newton's second law of motion an object's acceleration is equal to the force exerted on it by its mass
position vector quantity that specifies an object's location relative to some reference point
SI units metric system
speed measure of the distance an object travels in a certain amount of time
trajectory path taken by an object as it moves
vector quantity quantity that consists of both a magnitude and a direction in space
velocity vector quantity that measures how quickly an object's position is changing
weight downward force exerted on an object due to its gravitational interaction with the earth; weight is mass times acceleration due to gravity (which at earth's surface is 1), and direction is toward the center of the earth