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

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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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