# Shared Flashcard Set

## Details

Physics Vocab
ch. 1 and 2
33
Physics
08/22/2007

Term
 physics
Definition
 study of matter, energy, and their relationships
Term
 dimensional analysis
Definition
 checks if answer will be in hte correct units
Term
 sig digits
Definition
 valid digits in a measurement
Term
 scientific method
Definition
 observations, experiments, and creating compelling explanations quantitavely describing phenomena
Term
 hypothesis
Definition
 educated guess about how variables are related
Term
 scientific law
Definition
 rule of nature summing up related observations to describe a pattern in nature
Term
 scientific theory
Definition
 explanation based on many observations supported by experimental results
Term
 measurement
Definition
 comparison btwn. unknown quantity and standard
Term
 precision
Definition
 degree of exactness of a measurement
Term
 accuracy
Definition
 how well results of measurement agree with accepted value
Term
 indep. variable
Definition
 factor manipulated during experiment
Term
 dep. variable
Definition
 factor depending on indep. variable
Term
 line of best fit
Definition
 line drawn as close to all data points as possible; models predictions
Term
 linear relationship
Definition
 dep. variable varies linearly with indep. variable
Term
Definition
 one variable depends on the square of another
Term
 inverse relationship
Definition
 one variable depends on the inverse of the other
Term
 motion diagram
Definition
 series of images showing the positions of a moving object at equal time intervals
Term
 particle model
Definition
 simplified version of a motion diagram where object in motion is replaced by a series of single points.
Term
 coordinate system
Definition
 location of the zero point of the variable and the direction where the values of the variable increase
Term
 origin
Definition
 point where both variables are zero
Term
 position
Definition
 separation btwn. object and origin
Term
 distance
Definition
 how far object is from origin
Term
 magnitude
Definition
 size
Term
 vector
Definition
 quantity with magnitude and direction
Term
 scalar
Definition
 quantity that is just a number without a direction
Term
 resultant
Definition
 vector representing sum of other 2 vectors
Term
 time interval
Definition
 dif. btwn. 2 times
Term
 displacement
Definition
 change in position
Term
 position-time graph
Definition
 graph with time data plotted on x-axis and position data on y-axis
Term
 instantaneous position
Definition
 position at a particular instant
Term
 average velocity
Definition
 slope of a position-time graph for an object
Term
 average speed
Definition
 how fast object is moving; absolute value of slope
Term
 instantaneous velocity
Definition
 speed and direction of an object at a particular instant
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