# Shared Flashcard Set

## Details

Chapter 3 Vocabulary
Words for Chapter 3!
21
Physics
10/28/2009

Term
 distance
Definition
 total path length from the starting point to end point, scalar quantity, symbol s, unit m
Term
 displacement
Definition
 straight line distance from the starting point to end point (distance traveled in a particular direction), vector quantity, symbol s, unit m
Term
 speed
Definition
 distance traveled divided by the time elapsed, scalar quantity, symbol v, unit m/s
Term
 velocity
Definition
 displacement traveled divided by time elapsed, vector quantity (direction same as displacement), symbol v, unit m/s
Term
 average velocity
Definition
 total displacement divided by the time elapsed
Term
 instantaneous velocity
Definition
 displacement per unit time at a particular point in time
Term
 uniform velocity
Definition
 when displacement per unit time is the same for every moment of time
Term
 acceleration
Definition
 change in velocity per unit time, vector quantity (may or may not have same direction as velocity), symbol a, unit m/s^2
Term
 free fall
Definition
 when an object is thrown up, thrown down, or dropped
Term
 Newton's First Law of Motion: Law of Inertia
Definition
 a) a body at rest will remain at rest unless acted upon by an unbalanced or net forceb) a body moving at uniform velocity will remain that way unless acted upon by an unbalanced or net force
Term
 Newton's Second Law of Motion
Definition
 an unbalanced or net force causes an acceleration which is directly proportional to the force and inversely proportional to the mass of the object, formula: Fnet=m*a
Term
 force
Definition
 a push or pull applied to an object, a vector quantity (direction is the same as the direction of acceleration), unit is N, symbol F
Term
 weight
Definition
 the measure of the gravitational force acting on an object, formula: Fw=m*g
Term
 Newton's Third Law of Motion: Action-Reaction
Definition
 if object A exerts a force on object B, object B will exert an equal but opposite force on object A
Term
 action force
Definition
 the object which exerts a force on the other
Term
 reaction force
Definition
 the object that exerts an equal but opposite force on the action force
Term
 Newton's Law of Universal Gravitation
Definition
 law that states that every object in the universe attracts every other object with a force which is directly proportional to the produce of their masses and inversely proportional to the square of the distance between their centers (approximately true when the objects are massive and far apart, absolutely true when objects are point masses), formula: Fg=(G*m1*m2)/s^2 (right side of formula comes to N)
Term
 gravitational field
Definition
 a region of space around a mass in which another mass feels a force
Term
 test mass
Definition
 1.0 kg mass used to test gravitational field
Term
 gravitational field strength
Definition
 the force felt by a 1.0 kg mass when place at a certain location in a gravitational field, vector quantity (direction is to the center of the celestial body causing the field), symbol g, at surface of earth g=9.8 N/kg
Term
 terminal velocity
Definition
 occurs for objects in free fall when the force of gravity pulling the object down equals the force of the air pushing the object up, Fnet=0, a=0, and the velocity is uniform
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