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Physical Science > Ch 3 - Measurement > Flashcards

Ch 3 - Measurement Flashcards

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1
Q

meter (m) measures the dimension of

A

length

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2
Q

kilogram (kg) measures the dimension of

A

mass

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3
Q

second (s) measures the dimension of

A

time

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4
Q

ampere (A) measures the dimension of

A

electric current

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5
Q

kelvin (K) measures the dimention of

A

absolute temperature

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6
Q

mole (mol) measures the dimension of

A

the amount of a substance

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7
Q

candela (cd) measures the dimension of

A

radiant intensity

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8
Q

peta (P-) means quadrillion which is exponent form:

A

10 to the 15th power

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9
Q

tera (T-) means trillion which is exponent form:

A

10 to the 12th power

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10
Q

giga (G-) means billion which is exponent form:

A

10 to the 9th power

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11
Q

mega (M-) means million which is exponent form:

A

10 to the 6th power

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12
Q

kilo (kill-o) (k-) means thousand which is exponent form:

A

10 to the 3rd power

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13
Q

hect- / hecto- (h-) means hundred which is exponent form:

A

10 to the 2nd power

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14
Q

deka (da-) means ten which is exponent form:

A

10 to the 1st power

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15
Q

1 is the base for metric and is in exponent form:

A

10 to the zero power

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16
Q

deci- (d-) means tenth and the exponent form is

A

10 to the negative 1 power

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17
Q

centi- (c-) means hundredth and the exponent form is

A

10 to the negative 2 power

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18
Q

milli- (m-) means thousandth and the exponent form is

A

10 to the negative 3 power

19
Q

micro- (mu) means millionth and the exponent form is

A

10 to the negative 6th power

20
Q

nano- (n-) means billionth and the exponent form is

A

10 to the negative 9th power

21
Q

pico- (p-) means trillionth and the exponent form is

A

10 to the negative 12th power

22
Q

If your data doesn’t match predictions, what 4 things could be wrong:

A 
You may have:
 used instrument wrong, 
 read instrument wrong, 
 instrument is broken/damaged, or 
 the environment wasn't good for measuring.
23
Q

Definition of accuracy

A

assessment of the measurement error.

AKA Indicates how close a measurement is to its acceptable value (smaller error means more accurate measurement).

24
Q

Definition of precision

A

assessment of the exactness of a measurement (more precise = more known digits). [Tool with finer markings can measure more precisely.]

25
Q

Definition of unit

A

a value of 1 (for any portion of a dimension).

26
Q

Measured data shows two things:

A

a number and a dimensional unit.

27
Q

France standardized measurements first, by establishing the decimal metric system.

A

True

28
Q

Number of base units the SI system has:

A

7 (m,kg,s,A,K,mol,cd)

29
Q

Precision does not apply to two things:

A

exact counts and quantities that are defined. (Precision applies to measurements, not counts or definitions.)

30
Q

Measurements can end with a zero that is significant in which case?

A

When a decimal point is present (all zeros to the right of the last nonzero digit are significant)

31
Q

T/F? Every measurement contains error, no matter how good the instrument and the observer are.

A

True

32
Q

weight indicates the amount of matter in an object, but it does not measure the amount of matter directly.

A

True

33
Q

Weight is the force of earth’s gravity acting on the matter of an object. T/F?

A

True

34
Q

Gravity on earth’s surface changes depending on various factors. T/F?

A

True

35
Q

Examples of quantitative data (numerical measurements):

A

temp, speed, time, volume

36
Q

Examples of qualitative data (word descriptions)

A

audibility of sound, pattern, shape, color

37
Q

T/F: Actual value of a measurement is more correctly referred to as “acceptable value” (because nothing can be perfectly measured enough to give us it’s ‘ACTUAL value’)

A

True

38
Q

Mass is a constant for a given object (it doesn’t depend on gravity).

A

True.

39
Q

Weight depends on the pull of gravity

A

True.

40
Q

What do we call the space occupied by an object?

A

it’s volume.

41
Q

Density is the amount of matter (mass) contained in an object compared to its volume.

A

True (D=M/V)

42
Q

Abbreviation for the system of internationally accepted metric units:

A

SI

43
Q

measurement error tends to be reduced by averaging several measurements of the same object

A

True

44
Q

The difference between each measurement and the average of many measurements is called random error.

A

True

Physical Science (8 decks)

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