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22 Cards in this Set
- Front
- Back
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Newton's First Law (Law on Inertia)
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an object continues in its state of rest or of uniform motion unless compelled to change that state by an external force
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a retarding force
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friction
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a push or pull that causes a body to changte its state of motion
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force
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Newtons Second Law
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if a net force acts on an object, it will cause an acceleration of that object (F = ma)
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the property that lends an object a reluctance to change its state of motion (inertia)
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mass
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the measure of the amount of matter in an object
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mass
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this property is invariable and would not change on the moon
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mass
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the force that exerts on an object of specific mass
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weight
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force measured in units of newtons and is a vector quantity
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weight (W = mg)
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a representation of the relationship between force and acceleration
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force diagram
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the force opposing the motion of one body sliding or rolling over the surface of second object
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friction
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the force of friction when there is no relative motion between two objects in contact
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static friction
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this scientist demolished the notion that a force is necessary to keep an object moving
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Galileo
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this is caused by irregularities in the surfaces of the objects that are touching
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friction
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T or F: if friction was absent, a moving object would need no force whatever to remain in motion
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TRUE
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this scientist argued that only when friction is present is a force needed to keep an object moving
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Galileo
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How did Galileo test his theory?
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by rolling balls along plane surfaces tilted at different angles.
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What did Galileo conclude based off his experiment?
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a ball rolling on a smooth horizontal plane has almost constant velocity - if friction were entirely absent, a ball moving horizonally would move forever without the need of a push or pull.
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This scientist came up with the theory of inertia
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Galileo
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the combination of all forces acting on an object
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net force
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normal force is always perpendicular to....?
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the supporting surface
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normal force is only present when the system rests on...?
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a surface
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