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8th Grade Chapters 1 Prentice Hall Science
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Gravity
Vocabulary from Prentice Hall's 8th Grade California Physical Science chapter 1.
Terms in this set (39)
hypothesis
a possible answer to a scientific question or explanation for a set of observations
manipulated variable
the one variable parameter that is purposely changed
responding variable
the variable parameter that is expected to change because of the manipulated variable
controlled experiment
an investigation in which only one parameter is manipulated at at time
controlled variable
Factor in an experiment that a scientist purposely keeps the same
model
a picture, diagram, computer image, or other representation of an object or process.
scientific theory
a well-tested explanation for a wide range of observations or experimental results.
scientific law
a statement that describes what scientists expect to happen every time under a particular set of conditions
SI
an expanded metric system
weight
a measure of the force of gravity on an object
mass
a measure of an amount of matter and object contains
volume
the amount of space an object takes up
meniscus
the curved top surface of a liquid
density
mass per unit volume
celsius scale
the temperature scale commonly used by scientists
kelvin scale
the SI unit of temperature
absolute zero
the temperature at which molecules stop moving, 0 K, -273 C
estimate
an approximation of a number based on reasonable assumptions
accuracy
how close a measurement is to the true or actual value
reproducibility
refers to how close a group of measurements are to each other
significant figures
all of digits in a measurement that that have been measured exactly, plus a digit whose value has been estimated
precision
a measure of the exactness of a measurement
graph
picture of data
horizontal axis
the graph line that runs left to right
vertical axis
the graph line that runs up and down
origin
the point where the two axes cross, zero
coordinate
a pair of numbers set to determine the position of a point on a graph
data point
the point of intersection
line of best fit
a smooth line that reflects the general patten of a graph
line graph
a line graph in which the data points yield a straight line, A graph that uses line segments to show changes that occur over time
slope
the steepness of the graph line
control group
A group separated from the rest of the experiment where the independent variable being tested cannot influence the results
conclusion
A summary based on evidence or facts
length
Distance between two points
conversion factor
A ratio of equivalent values used to express the same quantity in different units; is always equal to 1 and changes the units of a quantity without changing its value.
direct proportional
A term used to describe the relationship between two variables whose graph is a straight line passing through the point.
inverse proportion
a relationship in which the product of two variables is a constant
bar graph
A graph that uses horizontal or vertical bars to display data
data
Facts and statistics collected together for reference or analysis
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