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| close agreement by competent observers who make a series of observations of the same phenomenon |
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| general hypothesis or statement about the relationship of natural quantities |
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| educated guess that is not fully accepted until demonstrated by experiment that has been tested over and over again and has not been contradicted |
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| synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world |
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| combination of all forces acting on an object |
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| state wherein no physical changes occur; state of steadiness |
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| quantity that needs both magnitude and direction for a complete description |
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| quantity that can be described by magnitude only and has no direction |
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| the upward force that balances the weight of an object on a surface |
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| for an object resting on a horizontal surface, the upward force that balances the weight of an object |
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| property of a body to resist changes to its state of motion |
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| name given to the force that acts between materials that touch as they move past each other |
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| quantity of matter in an object; measure of inertia |
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| force of gravity on an object |
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| every object continues in a state of rest or of uniform speed in a straight line, unless acted upon by a nonzero net force |
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distance divided by time interval;
delta d/delta t |
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speed in a given direction;
displacement/delta t |
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rate at which velocity is changing;
delta v/delta t |
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| object moving under the influence of only gravity |
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| 2 values change in opposite directions |
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| 2 values change at the same rate |
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| acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, in the same direction as the net force, and is inversely proportional to the mass of an object |
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| diagram showing all forces acting on an object |
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| amount of force per unit of area; f/a |
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| friction of a falling object |
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| acceleration=0 because friction balances the forces out |
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| terminal speed with a direction of motion |
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| whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object |
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| change in momentum; mvf-mvi; ft |
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| Law of Conservation of Momentum |
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| in the absence of an external force, the momentum of a system remains unchanged |
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