acceleration - change in velocity, motion - a change in position, speed - how fast an object is moving, velocity - an object's speed and direction, balanced forces - forces that combine to create a net force of zero, force - the cause of a change in motion, friction - a force that resists the movement of one surface against another, gravity - the force of attraction between any two objects that have mass, net force - all the forces acting on an object, unbalanced forces - forces that combine to create a net force greater than zero, compound machine - machine made up of two or more simple machines working together, fulcrum - a fixed point around which a lever moves, simple machines - the most basic machines, work - when an object changes its position by moving in the direction of an applied force,

Ch. 3 Motion & Forces

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