## Kennesaw10thPhysics

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Trcy  on January 22, 2009

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# Kennesaw10thPhysics

 What is physics?branch of science that involves the study of the physical world: energy, matter, and how they are related; study of matter and energy and their relationships
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#### Definitions

What is physics? branch of science that involves the study of the physical world: energy, matter, and how they are related; study of matter and energy and their relationships
Why are concepts in physics described with formulas? they are used as important tools for modeling observations and for making predictions; it relies on theories and experiments with numerical results to support conclusions
What is a measurement? a comparison between an unknown quanity and a standard
What is precision? the degree of exactness of a measurement
What is accuracy? how well the results of a measurement agree with the "real" value
How are precision and accuracy related; how do they compare? Precision depends upon the instrument and technique used to make the measurement while accuracy has to do with how the measurement is measured by competent experimenters
What is a parallax? the apparent shift in the position of an object when it is viewed from different angles.
What can be used to demonstrate accuracy and precision? a Global Positioning System - offers an illustration of accuracy and precision
What is a variable? any factor that might affect the behavior of an experimental setup
What is the independent variable? the factor that is changed or manipulated during the experiment
What is a dependent variable? the factor that depends upon the independent variable
What is a line of best fit? a line on a graph drawn as close to all data points as possible; it is a better model for predictions than any one point that helps determine the line
Where is the independent variable plotted on a line graph? the horizontal axis or the x-axis
Where is the dependent variable plotted on a line graph? on the vertical axis or the y-axis
What are important components to a line graph? x-axis, y-axis, title,
What are linear relationships? when it can be written in the form of an equation because the dependent variable varies linearly with the independent variable
What is the formula for slope? m = rise/run = ^y/^x
What is the slope? the ratio of vertical change to the horizontal change
If y gets smaller as x gets larger what is the rise/run? negative and the line slopes downward
What is a quadratic relationship? one of the two types of nonlinear relationships - the other nonlinear is an inverse relationship
When does a quadratic relationship exist? when one variable depends on the square of another
What is an inverse relationship? when one variable depends on the inverse of the other
What is an example of an inverse relationship? a hyperbola
What is the formula for an inverse relationship? y = a/x
What do scientists use relations on a graph for? to make predictions
When is dimensional analysis used? it is used to check that an answer will be in the correct units
What are significant digits? means measurements can never be more precise than the least-precise measurement involved in the operation
What is the systematic method of observing, experimenting, and analyzing to answer questions about the natural world? scientific method
What are all measurements subject to? some uncertainty
What is the equation for slope? y = mx + b
What does m = rise/run represent? the slope of a straight-line graph - the vertical change is the rise and is divided by the horizontal change (run)
What is the equation for a quadratic relationship? y = ax + bx + c
What is the equation for an inverse relationship? y = a/x

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