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motion When an object changes position over time when compared with a reference point speed The rate at which an object moves velocity The speed of an object in a particular direction Acceleration Speed up force Push or pull newton Scientists express force using a unit called a net force The force that results from combining all the forces exerted on an object Friction A force that opposes motion betwwen two surfaces that are touching Gravity A force of attraction between objects that is due to their masses Weight A measure of the gravitational force exerted on an object Mass The amount of matter in an object, and its value does not change Formula for acceleration V(2)-V(1)/t Formula for average speed Distance/time Four types of Friction Sliding Friction, Rolling Friction, Fluid Friction, and Static Friction Law of Universal Gravitation Newton generalized his formula for velocity Unit for acceleration M/s/s Unit for average speed M/s Unit for force N