# Chapter 2 Vocabulary

### 28 terms by ccartwright12

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### Thought Experiment

an attempt at logically reasoning through what has happened.

### Accuracy

how close to the true value, or accepted value, a measurment is.

### Precision

the level of detail to which a measurement is taken.

### Parallax

the appearance of the shift in position of an object due to an actual shift in the position of the observer.

### Particle Model

a simplification of a complex system using particle representation.

### System

the focus of study in an expirement or situation.

### Frame of Reference

any method for locating an object in time and space.

### Displacement

the change in position of an object

### Distance

total path traversed during a given interval of time.

value/size

### Vector

any quantity defined by both magnitude and direction

### Scalar

any quantity defined by magnitude

### Vector Diagram

using vectors to represent displacment within a particle model.

### Average Velocity

the rate of change of position of an object

### Instantaneous Velocity

the rate of change of position at a given instant in time.

### Average Speed

the total distance traveled during a time interval divided by that time

### Instantaneous Speed

the magnitude of instantaneous velocity

### Motion Diagram

shows the position of an object at successive times.

### Time Interval

the difference between two times.

### 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

### Origin

the point at which both variables have the value zero

### Position

the separation between an object and the origin.

### Resultant

the vector that represents the sum of the other two vectors.

### Position-Time Graph

data can be represented by plotting the time data on a horizontal axis and the position data on a vertical axis.

### Instantaneous Position

the position at a particular instant.

### Average Acceleration

the rate of change of velocity.

### Free Fall

motion of an object solely under the influence of gravity.

### Physics

the study of the manner of energy.

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