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### 26 Cards in this Set

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 equilibrium rule ∑F=0 (sigma 'f'equals zero) force a push or a pull inertia the tendency of things to remain at rest if at rest, and in motion if in motion net force the combination of all forces that act act on an object Newton the scientific unit of force Newton's first law Every object continues in a state of rest or a state of motion in a straight line at a constant speed, unless it is compelled to change that state by forces exerted upon it. speed the distance traveled per time support force the force that supports an object against gravity vector quantity a quantity that specifies direction as well as magnitude velocity the speed of an object and specification of its direction of motion acceleration the rate at which velocity changes with time; the change may be in magnitude, direction or both air drag frictonal resistance due to motion through air free fall motion under the influence of gravitational pull only friction the resistive force that opposes the motion or attempted motion of an object past another with which it is in contact, or through a fluid inversely When two values change in opposite directions, so that if one increases and the other decreases by the same amount, they are said to be inversely proportional to each other. kilogram the fundamental SI unit of mass; one kilogram (symbol:kg) is the mass of 1 liter(l) of water at 4°C. Newton's second law The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. mass the quantity of matter in an object; more specifically, it is the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, deflect it, or change in any way its state of motion. terminal speed the speed at which the accerleration of a falling object terminates because air resistance balances its weight terminal velocity terminal speed with directon of motion (down for falling objects) volume the quantity of space an object occupies weight the force due to gravity on an object inertia the tendency of things to resist change in motion force pair the action and reaction pair of forces that occur in an interaction interaction mutual action between objects where each object exerts an equal and opposite force on the other Newton's third law Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first, or put another way, "to every action, there is always an opposed equal reaction"