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### 18 Cards in this Set

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 The distance traveled divided by the time interval in which the motion occurred. What is Speed? (252) Requires a "reference frame" or stationary background for measurement. A quantity defined as the product of an object's mass and its velocity. (P=MV) P = mass x velocity. What is Momentum? (256) More mass & more speed yields higher P. A quantity describing both speed and direction. What is Velocity? (254) Reguires "direction of motion" by cardinal or secondary directions from some fixed point, or the angle from a fixed line, or as positive/negative along the line of motion. Covering equal distances at equal amounts of time. Ex.: A ___ ____ of 96m/s means a car travels @ 96 meters every second. What is Constant Speed? (253) On a distance-time graph the slope or elevation of the plotted time-distance values become more elevated the faster the speed. If stationary the line will be horizontal w/ slope of zero. The change in velocity divided by the time interval in which the change occurred. What is Acceleration? ((259) _____= final velocity - initial velocity divided by time a = trianglexV divided by t The cause of acceleration, or change in object's velocity. What is Force? (262) This may be balanced or unbalanced. The ____ force is the combination of all ____ on an object that determines whether its velocity will change. The forces acting on an object that combine to produce a net force equal to zero. What are Balanced Forces? (263) The combined force = zero; ex. stalemate in tug-of-war when pulls of each team are equalized. The forces acting on an object that combine to produce a net nonzero force. What are Unbalanced Forces? (263) Ex. In tug-of-war when one force is greater than the other, and the rope moves in the direction of the greater force, it is called ________ ________. The force between two objects in contact that opposes the motion of either object. What is Friction? (265) Can be applied to stationary and moving objects. ex. brakes. The attraction between two particles of matter due to their mass. What is Gravity? (266) This force can be applied in proportion to two particles mass and inversely to the square of the distance between them. The tendency of an object to remain at rest or in motion with a constant velocity. What is Inertia? (269) All objects have this because they resist changes in motion. The correlation of force to mass = less mass = less force while greater mass = greater force. The motion of a body when only the force of gravity is acting on it. What is a Free Fall? (271) G-force = 9.8 m/s squared. In abscence of air resistance, all objects near Earth's surface accelerate at the same rate, regardless of their mass. The maximum velocity reached by a falling object in that occurs when the resistance of the medium is equal to the force of gravity. What is Terminal Velocity? (272) When air resistance and the force of gravity are equal, sky divers reach a terminal velocity of 320 km/h (200 mi/h) An object at rest remains at rest and an object in motion maintains a constant velocity unless it experiencs an unbalanced force. Also known as the Law of Inertia. What is Newton's 1st Law of Motion (LOM) This law is associated with friction & inertia. For every action force, their is an equal and opposite reaction force. What is Newton's 3nd Law of Motion? (268) Implies that forces always occur in pairs; applies to rocketry. ex. stepping off a boat onto the dock the boat pushes away from you. The unbalanced force acting on an object equals the objects' mass times its acceleration, or (F=ma) What is Newton's 2nd Law of Motion? (269) This involves a correlation between mass and acceleration. Higher mass yields greater acceleration & vice versa The SI unit of force. Weight equals the mass times free fall acceleration or (W = mg) What is the Newton? (270) (W = mg ) This scientist explained the relationship between motion and force in three laws of motion. Who was Sir Isaac Newton? (268) He also developed the theory for gravity when he observed an apple falling from a tree.