Term
|
Definition
|
Name
|
Symbol
|
Concept
|
|
Meter
|
M
|
Length
|
|
Kilogram
|
Kg
|
Mass
|
|
Second
|
S
|
Time
|
|
Ampere
|
A
|
Electric current
|
|
Kelvin
|
K
|
Temperature
|
|
Mole
|
Mol
|
Amount of matter
|
|
Candela
|
Cd
|
Intensity of light
|
|
|
|
Term
| when a quantity involves the measurement of two or more ________ ________, it is called a ________ ________. |
|
Definition
fundamental quantities
derived quantities |
|
|
Term
acceleration in fundamental units?
acceleration = velocity / time |
|
Definition
| m*s / s = m * s-1 s-1 = m * s-2 |
|
|
Term
and now work out kinetic energy into fundamental units
|
|
Definition
kinetic energy= 0.5 * m * v2
v=d/t
0.5 * kg * (m*s-1)2
K.E. = kg (m*s-1)2 = kg * m2 * s-2 = Joule |
|
|
Term
True value = 100°C
70°C, 71°C, 70°C
accurate or precise? |
|
Definition
|
|
Term
| Define accuracy and precision |
|
Definition
Accuracy= an indication of how close a measurement is to the accepted value. An accurate experiment has a low systematic error
Precision= an indicator of the agreement among a number of measurements made in the same way. A precise experment has a low random error |
|
|
Term
How many significant figures?
5.00
500
500. |
|
Definition
|
|
Term
Absolute uncertainty?
Fractional (relative) uncertainty?
Percentage uncertainty? |
|
Definition
smallest division.
absolute unc./measurement.
(absolute uncer./measur.) *100. |
|
|
Term
What is the product of 2.6 +-0.5 and 2.8+-0.5?
|
|
Definition
2.6*2.8=7.28=7.3
%age uncer.= (0.5/2.6)*100 and (0.5/2.8)*100 =19.2%+17.9%=37.1%
Absolute uncer. = 7.28*(37.1/100) = 3
therefore 7.3+-3 |
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