# Shared Flashcard Set

## Details

Chapter 2: Motion in 1D
From College Physics 7th Edition
13
Physics
07/14/2008

Term
 Dynamics
Definition
 The study of motion and of physical concepts such as force and mass is called dynamics.
Term
 Kinematics
Definition
 The part of dynamics that describes motion without regard to its causes is called kinematics.
Term
 Frame of reference
Definition
 A frame of reference is a choice of coordinate axes that defines the starting point for measuring any quantity, an essential first step in solving virtually any problems in mechanics.
Term
 Displacement
Definition
 The displacement Δx of an object is defined as its change in position, and is given by Δx = xf - xi  where the initial position of the object is labeled xi and the final position is xf.
Term
 Vector
Definition
 In general, a vector quantity is characterized by having both a magnitude and a direction.
Term
 Scalar
Definition
 A scalar quantity has a magnitude, but no direction.
Term
 Average speed
Definition
 The average speed of an object over a given time interval is deﬁned as the total distance traveled divided by the total time elapsed  [image]
Term
 Average velocity
Definition
 The average velocity [image] during a time interval [image] is the displacement [image] divided by [image] [image]
Term
 Average velocity
Definition
 The average velocity of an object during the time interval [image] is equal to the slope of the straight line joining the initial and final points on a graph of the object's position versus time.
Term
 Instantaneous velocity
Definition
 The instanteneous velocity [image] is the limit of the average velocity as the time interval [image] becomes infinitesimally small  [image]
Term
 Instanteneous velocity
Definition
 The slope of the line tangent to the position vs. time curve at A is defined to be the instantaneous velocity at that time.
Term
 Instantaneous speed
Definition
 The instantaneous speed of an object, which is a scalar quantity, is defined as the magnitude of the instantaneous velocity.
Term
 Average acceleration
Definition
 The average acceleration [image] during the time interval [image] is the change in velocity [image] divided by [image] [image]
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