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8th grade Science notes CH2
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32
Science
8th Grade
09/12/2012

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Cards

Term
What is a way to describe the world with numbers?
Definition
measurement
Term
What do measurements do?
Definition
anseres questions such as how much, how long, or how far
Term
What else can measurements do?
Definition
describe events
Term
What can help you make a rough measurement of an object?
Definition
estimation
Term
What can you use to estimate measurements?
Definition
comparisons
Term
What word do you often use when you estimate?
Definition
use the word about
Term
What is a description of how close measurements are to eachother?
Definition
precision
Term
What do you do when you compare a measurement to the real value?
Definition
describing accuracy
Term
How do you round a digit?
Definition
look at the digit to the right of the place being rounded to
Term
What digits are deleted if they are also to the right of a decimal?
Definition
the digits to the right of the digit being rounded
Term
What is the number of digits that truly reflect the precision of a number?
Definition
significant digits or significant figures
Term
What digits are always significat?
Definition
digits other that 0
Term
What zeros after a decimal point are significant?
Definition
final zeros
Term
Zeros between any other digits are what?
Definition
significant
Term
What zeros are NOT significant?
Definition
initial zeros
Term
For what operation do you determine thenumber of significant digits in your problem? The significant digits of your answer are determined by the number with fewer digits.
Definition
multipication and division
Term
For what operation do you determine the place value of each number in you problem? The significant digits of anser are determined by the number that is least precise.
Definition
additon and subtraction
Term
How do scientists avoid confustion?
Definition
they establishe the International systems of Units or SI, in 1960 as the accepted system for measurement
Term
How is length defined?
Definition
as the distance between two points
Term
What is the SI unit for length?
Definition
meter
Term
What is the amount of space an object occupies?
Definition
is it's volume
Term
How can smaller objects be measured?
Definition
in centimeters or millimeters
Term
The mass of an object measures what?
Definition
the amount of matter in the object
Term
What is the SI unit for mass?
Definition
kilogram
Term
What is a measurement of force?
Definition
weight
Term
What is the SI unit for weight?
Definition
the Newton
Term
WWhat is temperature?
Definition
the measure of the kinetic energy, or energy of motion, of the particles that make up matter
Term
Wat is the SI unit for temperature?
Definition
Kelvin
Term
What is the interval between two events?
Definition
time
Term
What is the SI unit for time?
Definition
second
Term
What is Time measured in?
Definition
hours
Term
What is the amount of change of one measurement in a given amount of time?
Definition
a rate
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