# chapter 2 vocab physics

### 19 terms by athens-2013

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### average speed

how fast an object is moving, is the absolute value of the slope of an object's position-time graph

### average velocity

the change in position, divided by the time during which the change occured, is the slope of an object's position-time graph

### constant velocity

a speed that does not change how fast it is, or the direction that it is in

### coordinate system

a system used to describe motion that gives the zero point location of the variable being studied and the direction in which the values of the variable increase

### displacement

a change in position having both magnitude and direction; is equal to the final position minus the initial position

### distance

a scalar quantity that describes how far an object is from the origin

### instantaneous position

the position of an object at any particular instant in time

### instantaneous velocity

a measure of motion that tells the speed and direction of an object at a specific instant in time

measure of size

### motion diagram

a series of images showing the positions of a moving object taken at regular (equal) time intervals

### origin

the point at which both variables in a coordinate system have the value zero

### particle model

a simplified version of a motion diagram in which the moving object is replaced by a series of single points

### position

the separation between an object and the origin; it can be either positive or negative

### position vs. time graph

a graph that can be used to determine an object's velocity and position, as well as where and when two objects meet, by plotting the time data on a horrizontal axis and the position data on a vertical axis

### scalar quantity

such as temperature or distance, that are just numbers without any direction

### slope of a position vs. time graph

indicates both the magnitude and direction, indicates the average velocity of the object and not its speed

### speed

relative rapidly in moving, going, etc. rate of motion or progress (distance/time)

### time interval

the difference between two times

### vector quantity

such as position, that have both magnitude and direction

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