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BJU Physics Chapter 2 - Measurement
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Gravity
Terms in this set (60)
mathematical formulas
Physical theoretical principles are usually expressed or defined by _____
Rømer
The first person to measure the speed of light was _____.
second
The SI unit for time is the _____.
mass
The measure of an object's tendency to resist a change in motion is that object's _____.
instruments
Tools that permit more exacting measurements than human senses are called _____.
calibration
Comparing an instrument's output to a standard to assess its accuracy is called a(n) _____.
Estimated
The last or least significant digit in a measurement is _____.
precision
The exactness of data is determined by the _____ with which it was measured.
measured
Significant digits apply only to _____ data.
Nonzero
_____ digits in a measurement are always significant.
significant digits
Certain digits in a measurement based on the instrument scale calibration and one estimated digit are collectively called ________ _____.
Radian
The SI unit for angle measure is the _____.
Vernier
Instruments that measure with extreme precision may use a _____ scale.
T
Observations of Jupiter's moon Io were used in first finding the speed of light.
F
The SI system of measurement is used exclusively in the United States.
F
The unit symbol for a dimension is usually the same as the variable symbol.
F
A second is currently defined as 1/86,400 of a mean solar day.
T
A 60.0 kg object on earth would have the same mass on the moon.
F
The only fundamental SI units are the meter, the second, and the kilogram.
F
The SI unit for luminous intensity is the ampere (A).
T
Mass is different from weight.
F
All derived SI units are expressed as combinations of the fundamental SI units.
T
1 µm = 10-6 m.
T
The combination of units on one side of an equation has to be the same as the net combination of units on the other side of the equation.
F
Precision instruments give us the exact value for the dimension measured.
F
A 100% error would indicate a very accurate measurement.
F
A precise instrument will always be accurate.
T
Zeroes between two non-zero digits are significant.
T
Accurate timekeeping is necessary in navigation.
4
How many significant digits in 6.022 1023 atoms
NA
How many significant digits in 100 cm/1 m
After a decimal point
When are trailing zeroes in a measurement significant?
1
How many significant digits in 0.0004 cm
4
How many significant digits in 10.01 s-1
1
How many significant digits are in 5000 N
4
How many significant digits are in 0.002 050 A
3
How many significant digits are in 1.00 10-3 N
3
How many significant digits in 4.02 N
NA
How many significant digits are in 5
4
How many significant digits in 2000. kg
4
How many significant digits are in 20.20 J
6
How many significant digits are in 100 005 ma
3
How many significant digits are in 2040 cd
4
How many significant digits are in 6.275 1023 g
NA
How many significant digits are in 12/1 dozen
2
How many significant digits are in 14,000 V
SI
the system of standardized units used by scientists worldwide
dimension
any measurable property such as mass, force, or time
space
a volume in which matter may be found
time
a nonphysical continuum that orders the sequence of events and phenomena
matter
any substance that occupies spatial volume and has mass
mole
the SI fundamental unit used to measure the amount of substance; the same number of entities as the number of atoms found in 12 grams of the element carbon-12
conversion factor
a multiplication factor that converts the units of a quantity to other units of the same dimension while preserving the size of the quantity
unit analysis
problem-solving method in which units in factors on one side of an equation cancel so that the remaining units can be compared to the expected units in the solution
precision
how close several measurements of the same quantity are to each other
error
the difference between a measured value and the actual or accepted value
uncertainty
the estimated maximum value by which a measurement might differ from the exact value; a measure of the precision of an instrument
significant digits
all of the digits that are known for certain based on an instrument's scale markings, plus one estimated digit
radian
an SI unit of angular measure
order of magnitude
a comparison of two values expressed to the nearest integer power of 10
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