# Shared Flashcard Set

## Details

Kelly Moon
Physics terms necessary to know for the final.
34
Physics
12/13/2009

Term
 fact
Definition
 close agreement by competent observers who make a series of observations of the same phenomenon
Term
 law
Definition
 general hypothesis or statement about the relationship of natural quantities
Term
 hypothesis
Definition
 educated guess that is not fully accepted until demonstrated by experiment that has been tested over and over again and has not been contradicted
Term
 theory
Definition
 synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world
Term
 force
Definition
 a push or a pull
Term
 net force
Definition
 combination of all forces acting on an object
Term
 mechanical equilibrium
Definition
 state wherein no physical changes occur; state of steadiness
Term
 vector quantity
Definition
 quantity that needs both magnitude and direction for a complete description
Term
 scalar quantity
Definition
 quantity that can be described by magnitude only and has no direction
Term
 support force
Definition
 the upward force that balances the weight of an object on a surface
Term
 normal force
Definition
 for an object resting on a horizontal surface, the upward force that balances the weight of an object
Term
 inertia
Definition
 property of a body to resist changes to its state of motion
Term
 friction
Definition
 name given to the force that acts between materials that touch as they move past each other
Term
 mass
Definition
 quantity of matter in an object; measure of inertia
Term
 weight
Definition
 force of gravity on an object
Term
 Newton's 1st Law
Definition
 every object continues in a state of rest or of uniform speed in a straight line, unless acted upon by a nonzero net force
Term
 average speed
Definition
 distance divided by time interval; delta d/delta t
Term
 instantaneous speed
Definition
 speed at any instant
Term
 velocity
Definition
 speed in a given direction; displacement/delta t
Term
 acceleration
Definition
 rate at which velocity is changing;delta v/delta t
Term
 free fall
Definition
 object moving under the influence of only gravity
Term
 acceleration of gravity
Definition
 g=10 m/s2
Term
 inversely proportional
Definition
 2 values change in opposite directions
Term
 directly proportional
Definition
 2 values change at the same rate
Term
 Newton's 2nd Law
Definition
 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
Term
 free-body diagram
Definition
 diagram showing all forces acting on an object
Term
 pressure
Definition
 amount of force per unit of area; f/a
Term
 air resistance
Definition
 friction of a falling object
Term
 terminal speed
Definition
 acceleration=0 because friction balances the forces out
Term
 terminal velocity
Definition
 terminal speed with a direction of motion
Term
 Newton's 3rd Law
Definition
 whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object
Term
 momentum
Definition
 mass x velocity; mv
Term
 impulse
Definition
 change in momentum; mvf-mvi; ft
Term
 Law of Conservation of Momentum
Definition
 in the absence of an external force, the momentum of a system remains unchanged
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