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18 Cards in this Set
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- Back
- 3rd side (hint)
The distance traveled divided by the time interval in which the motion occurred.
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What is Speed? (252)
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Requires a "reference frame" or stationary background for measurement.
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A quantity defined as the product of an object's mass and its velocity. (P=MV)
P = mass x velocity. |
What is Momentum? (256)
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More mass & more speed yields higher P.
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A quantity describing both speed and direction.
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What is Velocity? (254)
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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.
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Covering equal distances at equal amounts of time. Ex.: A ___ ____ of 96m/s means a car travels @ 96 meters every second.
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What is Constant Speed? (253)
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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.
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The change in velocity divided by the time interval in which the change occurred.
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What is Acceleration? ((259)
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_____= final velocity - initial velocity
divided by time a = trianglexV divided by t |
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The cause of acceleration, or change in
object's velocity. |
What is Force? (262)
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This may be balanced or unbalanced. The ____ force is the combination of all ____ on an object that determines whether its velocity will change.
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The forces acting on an object that combine to produce a net force equal to zero.
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What are Balanced Forces? (263)
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The combined force = zero; ex. stalemate in tug-of-war when pulls of each team are equalized.
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The forces acting on an object that combine to produce a net nonzero force.
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What are Unbalanced Forces? (263)
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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 ________ ________.
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The force between two objects in contact that opposes the motion of either object.
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What is Friction? (265)
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Can be applied to stationary and moving objects. ex. brakes.
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The attraction between two particles of matter due to their mass.
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What is Gravity? (266)
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This force can be applied in proportion to two particles mass and inversely to the square of the distance between them.
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The tendency of an object to remain at rest or in motion with a constant velocity.
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What is Inertia? (269)
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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.
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The motion of a body when only the force of gravity is acting on it.
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What is a Free Fall? (271)
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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.
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The maximum velocity reached by a falling object in that occurs when the resistance of the medium is equal to the force of gravity.
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What is Terminal Velocity? (272)
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When air resistance and the force of gravity are equal, sky divers reach a terminal velocity of 320 km/h (200 mi/h)
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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)
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This law is associated with friction & inertia.
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For every action force, their is an equal and opposite reaction force.
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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.
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The unbalanced force acting on an object equals the objects' mass times its acceleration, or (F=ma)
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What is Newton's 2nd Law of Motion? (269)
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This involves a correlation between mass and acceleration. Higher mass yields greater acceleration & vice versa
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The SI unit of force. Weight equals the mass times free fall acceleration or
(W = mg) |
What is the Newton? (270)
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(W = mg )
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This scientist explained the relationship between motion and force in three laws of motion.
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Who was Sir Isaac Newton? (268)
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He also developed the theory for gravity when he observed an apple falling from a tree.
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